Azetidine-substituted quinoxalines as opioid receptor like-1 modulators

ABSTRACT

The disclosure relates to Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I): 
                         
and pharmaceutically acceptable derivatives thereof wherein the R 1 , R 2 , R 3 , Q, Y 1 , Z, A, B, a, and b are as defined herein, compositions comprising an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound, and methods to treat or prevent a condition, such as pain, comprising administering to an animal in need thereof an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound.

This application is a national stage of International application no. PCT/IB2012/002689, filed Nov. 30, 2012, which claims the benefit under 35 U.S.C. §119(e) of provisional application No. 61/565,836, filed Dec. 1, 2011, the contents of all of which are incorporated herein by reference.

1. FIELD

The disclosure relates to Azetidine-Substituted Quinoxaline-Type Piperidine Compounds, compositions comprising an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound and methods to treat or prevent a condition, such as pain, comprising administering to an animal in need thereof an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound.

2. BACKGROUND

Chronic pain is a major contributor to disability and is the cause of much suffering. The successful treatment of severe and chronic pain is a primary goal of the physician, with opioid analgesics being preferred drugs for doing so.

Three major classes of opioid receptors in the central nervous system (CNS) have long been known, with each class having subtype receptors. These receptor classes are known as μ, κ and δ. As opiates have a high affinity for these receptors while not being endogenous to the body, research followed in order to identify and isolate the endogenous ligands to these receptors. These ligands were identified as endorphins, dynorphins and enkephalins, respectively.

Experimentation eventually led to the identification of a cDNA encoding an opioid receptor-like (ORL-1) receptor with a high degree of homology to the known receptor classes. The ORL-1 receptor was classified as an opioid receptor based only on structural grounds, as the receptor did not exhibit pharmacological homology. It was initially demonstrated that non-selective ligands having a high affinity for μ, κ and δ receptors had low affinity for the ORL-1 receptor. This characteristic, along with the fact that an endogenous ligand had not yet been discovered, led to the term “orphan receptor.” See, e.g., Henderson et al., “The orphan opioid receptor and its endogenous ligand—nociceptin/orphanin FQ,” Trends Pharmacol. Sci. 18(8):293-300 (1997).

Subsequent research led to the isolation and structure of the endogenous ligand of the ORL-1 receptor (i.e., nociceptin; also known as orphanin FQ (OFQ)). This ligand is a seventeen amino acid peptide structurally similar to members of the opioid peptide family.

The discovery of the ORL-1 receptor presents an opportunity in drug discovery for novel compounds that can be administered for pain management or other syndromes modulated by this receptor.

International PCT Publication Nos. WO 99/46260, WO 99/50254, WO 01/90102, WO 2005/028451, WO 2003/062234, and U.S. Pat. App. No. 2005/0256000, respectively, describe quinoxalines or derivatives thereof as (i) inhibitors of protein kinase C, (ii) serine protease inhibitors, (iii) herbicides, (iv) M2 acetylcholine receptor agonists, (v) medicaments for diseases involving poly(ADP-ribose) polymerase, and (vi) safeners for plants.

Citation of any reference in Section 2 of this application is not to be construed as an admission that such reference is prior art to the present application.

3. SUMMARY

In one aspect of the disclosure, new compounds that exhibit affinity for the ORL-1 receptor are described.

In some embodiments, such new compounds exhibit agonist activity or partial agonist activity at the ORL-1 receptor. In other embodiments, such new compounds exhibit agonist activity at the ORL-1 receptor. In other embodiments, such new compounds exhibit partial agonist activity at the ORL-1 receptor. In yet other embodiments, such new compounds exhibit antagonist activity at the ORL-1 receptor.

In another embodiment of the disclosure, such new compounds exhibit affinity for the ORL-1 receptor, and also for one or more of the μ, κ or δ receptors. In some embodiments, a new compound of the disclosure exhibits affinity for both the ORL-1 receptor and the μ receptor. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor agonist or partial agonist and as a μ receptor agonist or partial agonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor agonist and as a μ receptor agonist or partial agonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor partial agonist and as a μ receptor agonist or partial agonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor agonist or partial agonist and as a μ receptor agonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor agonist or partial agonist and as a μ receptor partial agonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor agonist and as a μ receptor agonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor agonist and as a μ receptor partial agonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor partial agonist and as a μ receptor agonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor partial agonist and as a μ receptor partial agonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor agonist or partial agonist and as a μ receptor antagonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor agonist and as a μ receptor antagonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor partial agonist and as a μ receptor antagonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor antagonist and as a μ receptor agonist or partial agonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor antagonist and as a μ receptor agonist. In other embodiments, a new compound of the disclosure acts as an ORL-1 receptor antagonist and as a μ receptor partial agonist.

Certain new compounds of the disclosure can be used to treat an animal suffering from chronic or acute pain.

In another embodiment of the disclosure, methods for treating chronic or acute pain in an animal by administering one or more Azetidine-Substituted Quinoxaline-Type Piperidine Compounds to an animal in need of such treatment are described. In certain embodiments, such new Azetidine-Substituted Quinoxaline-Type Piperidine Compounds effectively treat chronic or acute pain in the animal, while producing fewer or reduced side effects compared to previously available compounds.

Compounds of Formula (I) are herein disclosed:

or a pharmaceutically acceptable derivative thereof wherein:

Y₁ is O or S;

Q is benzo or (5- or 6-membered)heteroaryl;

each R₂ is independently selected from:

-   -   (a) -halo, —CN, —NO₂, —OT₃, —C(═O)T₃, —C(═O)OT₃,         —C(═O)N(T₁)(T₂), —S(═O)₂OT₃, —S(═O)T₃, —S(═O)₂T₃, —O—S(═O)₂T₃,         —S(═O)₂N(T₁)(T₂), —N(T₁)(T₂), —N(T₃)C(═O)T₃,         —N(T₃)C(═O)N(T₁)(T₂), —N(T₃)S(═O)T₃, —N(T₃)S(═O)₂T₃,         —N(T₃)C(═O)OT₃, and —N(T₃)S(═O)₂N(T₁)(T₂); and     -   (b) —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl,         —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, —(C₆-C₁₄)bicycloalkyl,         —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl,         —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, -(5- or         6-membered)heterocycle, and -(7- to         10-membered)bicycloheterocycle, each of which is unsubstituted         or substituted with 1, 2, or 3 independently selected R₈ groups;         and     -   (c) -phenyl, -naphthalenyl, —(C₁₄)aryl, or -(5- or         6-membered)heteroaryl, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₇ groups;

a is an integer selected from 0, 1, and 2;

each R₃ is independently selected from:

-   -   (a) -halo, —CN, —NO₂, —OT₃, —C(═O)T₃, —C(═O)OT₃,         —C(═O)N(T₁)(T₂), —S(═O)₂OT₃, —S(═O)T₃, —S(═O)₂T₃, —O—S(═O)₂T₃,         —S(═O)₂N(T₁)(T₂), —N(T₁)(T₂), —N(T₃)C(═O)T₃,         —N(T₃)C(═O)N(T₁)(T₂), —N(T₃)S(═O)T₃, —N(T₃)S(═O)₂T₃,         —N(T₃)C(═O)OT₃, and —N(T₃)S(═O)₂N(T₁)(T₂); and     -   (b) —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl,         —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, —(C₆-C₁₄)bicycloalkyl,         —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl,         —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, -(5- or         6-membered)heterocycle, and -(7- to         10-membered)bicycloheterocycle, each of which is unsubstituted         or substituted with 1, 2, or 3 independently selected R₈ groups;

b is an integer selected from 0, 1, and 2;

A and B are independently selected from:

-   -   (a) —H, —CN, —C(═O)OT₃, and —C(═O)N(T₁)(T₂); and     -   (b) —(C₃-C₁₂)cycloalkyl, —(C₃-C₁₂)cycloalkoxy, —(C₁-C₆)alkyl,         —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, and —(C₁-C₆)alkoxy, each of         which is unsubstituted or substituted with 1 or 2 substituents         independently selected from —OH, —S(═O)₂NH₂, —N(R₆)₂, ═NR₆,         —C(═O)OT₃, —C(═O)N(R₆)₂, —N(R₆)C(═O)R₉, and -(5- or         6-membered)heterocycle, or 1, 2, or 3 independently selected         -halo; or     -   (c) A-B can together form a (C₂-C₆)bridge, which is         unsubstituted or substituted with 1, 2, 3, 4, 5, 6, 7 or 8         substituents independently selected from —OH, —(C₁-C₄)alkyl,         -halo, and —C(halo)₃, and which bridge optionally contains         —HC═CH— or —O— within the (C₂-C₆)bridge; wherein the 6-membered,         nitrogen-containing ring that is fused to the Q group can be in         the endo- or exo-configuration with respect to the A-B bridge;         or     -   (d) A-B can together form a —CH₂—N(R_(a))—CH₂— bridge, a

wherein the 6-membered, nitrogen-containing ring that is fused to the Q group can be in the endo- or exo-configuration with respect to the A-B bridge;

R_(a) is —H, —(C₁-C₆)alkyl, —(C₃-C₇)cycloalkyl, —CH₂—C(═O)—R_(c), —(CH₂)—C(═O)—OR_(c), —(CH₂)—C(═O)—N(R_(c))₂, —(CH₂)₂—O—R_(c), —(CH₂)₂—S(═O)₂—N(R_(c))₂, R_(c), or —(CH₂)₂—N(R_(c))S(═O)₂—R_(c);

R_(b) is selected from:

-   -   (a) —H, —(C₁-C₆)alkyl, —(C₃-C₇)cycloalkyl, -(3- to         7-membered)heterocycle, —N(R_(c))₂, —N(R_(c))—(C₃-C₇)cycloalkyl,         and —N(R_(c))-(3- to 7-membered)heterocycle; and     -   (b) -phenyl, -naphthalenyl, and -(5- or 6-membered)heteroaryl,         each of which is unsubstituted or substituted with 1, 2, or 3         independently selected R₇ groups; and     -   (c) —N(R_(c))-phenyl, —N(R_(c))-naphthalenyl,         —N(R_(c))—(C₁₄)aryl, and —N(R_(c))-(5- to         10-membered)heteroaryl, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₇ groups;

each R_(c) is independently —H or —(C₁-C₄)alkyl;

Z is —[(C₁-C₁₀)alkyl optionally substituted by R₁₃]_(h)—, wherein h is 0 or 1; or —[(C₂-C₁₀)alkenyl optionally substituted by R₁₃]—; or —(C₁-C₁₀)alkyl-N(R₆)C(═Y)—, wherein Y is O or S;

R₁ is selected from:

-   -   (a) —H, -halo, —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂,         —S(═O)NH₂, —S(═O)₂NH₂, —C(═O)OV₁, and —C(═O)CN; and     -   (b) —(C₁-C₁₀)alkyl, —(C₂-C₁₀)alkenyl, —(C₂-C₁₀)alkynyl,         —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy, —(C₆-C₁₄)bicycloalkyl,         —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl,         —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, and -(3- to         7-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, 3, or 4 independently selected R₈ groups;         and     -   (c)

-   -    and     -   (d) -phenyl, -naphthalenyl, —(C₁₄)aryl, and -(5- to         10-membered)heteroaryl, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₇ groups; or

—Z—R₁ is 3,3-diphenylpropyl- optionally substituted at the 3 carbon of the propyl with —CN, —C(═O)N(R₆)₂, —C(═O)OV₁, or -tetrazolyl; or

—Z—R₁ is —(C₁-C₄)alkyl substituted with tetrazolyl;

each R₅ is independently —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), —CN, ═O, ═S, -halo, —N₃, —NO₂, —CH═N(R₉), —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)R₁₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)OR₉, —OC(═O)R₉, —OC(═O)OR₉, —S(═O)R₉, or —S(═O)₂R₉;

each R₆ is independently —H, —(C₁-C₆)alkyl, or —(C₃-C₇)cycloalkyl, or two R₆ groups attached to the same nitrogen atom can together form a 5- to 8-membered ring, wherein the number of atoms in the ring includes the nitrogen atom, and in which one of the 5- to 8-membered ring carbon atoms is optionally replaced by O, S, or N(T₃);

each R₇ is independently —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), —CN, -halo, —N₃, —NO₂, —CH═N(R₉), —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)R₁₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)N(T₁)(T₂), —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)N(T₁)(T₂), —C(═O)OR₉, —OC(═O)R₉, —OC(═O)N(T₁)(T₂), —OC(═O)OR₉, —S(═O)R₉, or —S(═O)₂R₉;

each R₈ is independently —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), —CN, ═O, ═S, -halo, —N₃, —NO₂, —CH═N(R₉), —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)R₁₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)N(T₁)(T₂), —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)N(T₁)(T₂), —C(═O)OR₉, —OC(═O)R₉, —OC(═O)N(T₁)(T₂), —OC(═O)OR₉, —S(═O)R₉, or —S(═O)₂R₉;

each R₉ is independently —H, —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, —(C₃-C₈)cycloalkyl, —(C₅-C₈)cycloalkenyl, -phenyl, -benzyl, -(3- to 7-membered)heterocycle, —C(halo)₃, —CH(halo)₂, or —CH₂(halo);

if h is 0, then R₁₁ can be —H, —CN, —C(═O)OR₉, or —C(═O)N(R₆)₂ or R₁₁ can be —(C₁-C₄)alkyl which is unsubstituted or substituted with —OH, —(C₁-C₄)alkoxy, —N(R₆)₂, —C(═O)OR₉, or —C(═O)N(R₆)₂;

if h is 1, then R₁₁ can be —H, —CN, —OH, -halo, —C(═O)OR₉, or —C(═O)N(R₆)₂ or R₁₁ can be —(C₁-C₄)alkyl which is unsubstituted or substituted with —OH, —(C₁-C₄)alkoxy, —N(R₆)₂; —C(═O)OR₉, or —C(═O)N(R₆)₂;

otherwise, wherein Z is —[(C₂-C₁₀)alkenyl optionally substituted by R₁₃]— or —(C₁-C₁₀)alkyl-N(R₆)C(═Y)—, then R₁₁ can be —H, —CN, —C(═O)OR₉, or —C(═O)N(R₆)₂ or R₁₁ can be —(C₁-C₄)alkyl which is unsubstituted or substituted with —OH, —(C₁-C₄)alkoxy, —N(R₆)₂, —C(═O)OR₉, or —C(═O)N(R₆)₂;

each R₁₂ is independently —H or —(C₁-C₄)alkyl;

R₁₃ is selected from:

-   -   (a) -halo, —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂,         —S(═O)NH₂, —S(═O)₂NH₂; —C(═O)OV₁, and —C(═O)CN; and     -   (b) —(C₁-C₁₀)alkyl, —(C₂-C₁₀)alkenyl, —(C₂-C₁₀)alkynyl,         —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy, —(C₅-C₁₀)cycloalkenyl, and         -(3- to 7-membered)heterocycle, each of which is unsubstituted         or substituted with 1, 2, 3, or 4 independently selected R₃         groups; and     -   (c)

-   -    and     -   (d) -phenyl and -(5- to 10-membered)heteroaryl, each of which is         unsubstituted or substituted with 1, 2, or 3 independently         selected R₇ groups;

R₁₄ is —H, —CN, —OH, -halo, —C(═O)OR₉, or —C(═O)N(R₆)₂ or R₁₄ can be —(C₁-C₄)alkyl which is unsubstituted or substituted with —OH, —(C₁-C₄)alkoxy, —N(R₆)₂, —C(═O)OR₉, or —C(═O)N(R₆)₂;

m is an integer selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11;

n is an integer selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9;

e and f are each an integer independently selected from 0, 1, 2, 3, 4, and 5 provided that 2≦(e+f)≦5;

each p is an integer independently selected from 0, 1, 2, 3, and 4;

each T₁ and T₂ is independently —H or —(C₁-C₁₀)alkyl which is unsubstituted or substituted with 1, 2, or 3 independently selected R₅ groups and, optionally, in which any —(C₁-C₁₀)alkyl carbon atom except the carbon atom bonded directly to the atom to which T₁ or T₂ is attached is independently replaced by O, S, or N(R₆), or T₁ and T₂ can together form a 5- to 8-membered ring wherein the number of atoms in the ring includes the nitrogen atom to which T₁ and T₂ are bonded, said 5- to 8-membered ring is unsubstituted or substituted with 1, 2, or 3 independently selected R₅ groups and, optionally, any carbon atom in said 5- to 8-membered ring is independently replaced by O, S, or N(R₆);

each T₃ is independently —H or —(C₁-C₁₀)alkyl which is unsubstituted or substituted with 1, 2, or 3 independently selected R₅ groups and, optionally, in which any —(C₁-C₁₀)alkyl carbon atom except the carbon atom bonded directly to the atom to which T₃ is attached is independently replaced by O, S, or N(R₁₂);

each V₁ is independently —H, —(C₁-C₆)alkyl, —(C₃-C₇)cycloalkyl, -phenyl, or benzyl; and

each halo is independently —F, —Cl, —Br, or —I.

A compound of Formula (I) or a pharmaceutically acceptable derivative thereof (an “Azetidine-Substituted Quinoxaline-Type Piperidine Compound”) is useful, e.g., as an analgesic, anti-inflammatory, diuretic, anesthetic agent, neuroprotective agent, anti-hypertensive, an anxiolytic agent, an agent for appetite control, hearing regulator, anti-tussive, anti-asthmatic, modulator of locomotor activity, modulator of learning and memory, regulator of neurotransmitter release, regulator of hormone release, kidney function modulator, anti-depressant, agent to treat memory loss due to Alzheimer's disease and/or other dementias, anti-epileptic, anti-convulsant, agent to treat withdrawal from alcohol, agent to treat withdrawal from drug(s) of addiction, agent to control water balance, agent to control sodium excretion, and/or agent to control arterial blood pressure disorder(s).

An Azetidine-Substituted Quinoxaline-Type Piperidine Compound is useful for treating and/or preventing pain, anxiety, cough, diarrhea, high blood pressure, epilepsy, anorexia/cachexia, urinary incontinence, drug abuse, memory disorders, obesity, constipation, depression, dementia, or Parkinsonism (each being a “Condition”) in an animal.

Compositions comprising an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound and a pharmaceutically acceptable carrier or excipient are disclosed. The compositions are useful for treating or preventing a Condition in an animal.

Methods for treating or preventing a Condition, comprising administering to an animal in need thereof an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound are disclosed. Azetidine-Substituted Quinoxaline-Type Piperidine Compounds, e.g., of Formula (I), may also be used in the manufacture of a medicament useful for treating a Condition or for preventing a Condition.

Methods for inhibiting ORL-1 receptor function in a cell, comprising contacting a cell capable of expressing the ORL-1 receptor with an ORL-1 receptor function inhibiting amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound are disclosed. In further embodiments of the disclosure, methods for activating ORL-1 receptor function in a cell, comprising contacting a cell capable of expressing the ORL-1 receptor with an ORL-1 receptor function activating amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound are disclosed. In yet another embodiment, methods for preparing a composition, comprising the step of admixing an Azetidine-Substituted Quinoxaline-Type Piperidine Compound and a pharmaceutically acceptable carrier or excipient, are disclosed.

An embodiment of the disclosure relates to a kit comprising a container containing an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound.

Another embodiment of the disclosure provides novel intermediates for use in making the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds.

The disclosure can be understood more fully by reference to the following detailed description and illustrative examples, which are intended to exemplify non-limiting embodiments of the disclosure.

4. DETAILED DESCRIPTION

The disclosure includes the following:

(1) A compound of Formula (I):

or a pharmaceutically acceptable derivative thereof wherein:

Y₁ is O or S;

Q is benzo or (5- or 6-membered)heteroaryl;

each R₂ is independently selected from:

-   -   (a) -halo, —CN, —NO₂, —OT₃, —C(═O)T₃, —C(═O)OT₃,         —C(═O)N(T₁)(T₂), —S(═O)₂OT₃, —S(═O)T₃, —S(═O)₂T₃, —O—S(═O)₂T₃,         —S(═O)₂N(T₁)(T₂), —N(T₁)(T₂), —N(T₃)C(═O)T₃,         —N(T₃)C(═O)N(T₁)(T₂), —N(T₃)S(═O)T₃, —N(T₃)S(═O)₂T₃,         —N(T₃)C(═O)OT₃, and —N(T₃)S(═O)₂N(T₁)(T₂); and     -   (b) —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl,         —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, —(C₆-C₁₄)bicycloalkyl,         —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl,         —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, -(5- or         6-membered)heterocycle, and -(7- to         10-membered)bicycloheterocycle, each of which is unsubstituted         or substituted with 1, 2, or 3 independently selected R₈ groups;         and     -   (c) -phenyl, -naphthalenyl, —(C₁₄)aryl, or -(5- or         6-membered)heteroaryl, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₇ groups;

a is an integer selected from 0, 1, and 2;

each R₃ is independently selected from:

-   -   (a) -halo, —CN, —NO₂, —OT₃, —C(═O)T₃, —C(═O)OT₃,         —C(═O)N(T₁)(T₂), —S(═O)₂OT₃, —S(═O)T₃, —S(═O)₂T₃, —O—S(═O)₂T₃,         —S(═O)₂N(T₁)(T₂), —N(T₁)(T₂), —N(T₃)C(═O)T₃,         —N(T₃)C(═O)N(T₁)(T₂), —N(T₃)S(═O)T₃, —N(T₃)S(═O)₂T₃,         —N(T₃)C(═O)OT₃, and —N(T₃)S(═O)₂N(T₁)(T₂); and     -   (b) —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl,         —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, —(C₆-C₁₄)bicycloalkyl,         —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl,         —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, -(5- or         6-membered)heterocycle, and -(7- to         10-membered)bicycloheterocycle, each of which is unsubstituted         or substituted with 1, 2, or 3 independently selected R₈ groups;

b is an integer selected from 0, 1, and 2;

A and B are independently selected from:

-   -   (a) —H, —CN, —C(═O)OT₃, and —C(═O)N(T₁)(T₂); and     -   (b) —(C₃-C₁₂)cycloalkyl, —(C₃-C₁₂)cycloalkoxy, —(C₁-C₆)alkyl,         —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, and —(C₁-C₆)alkoxy, each of         which is unsubstituted or substituted with 1 or 2 substituents         independently selected from —OH, —S(═O)₂NH₂, —N(R₆)₂, ═NR₆,         —C(═O)OT₃, —C(═O)N(R₆)₂, —N(R₆)C(═O)R₉, and -(5- or         6-membered)heterocycle, or 1, 2, or 3 independently selected         -halo; or     -   (c) A-B can together form a (C₂-C₆)bridge, which is         unsubstituted or substituted with 1, 2, 3, 4, 5, 6, 7 or 8         substituents independently selected from —OH, —(C₁-C₄)alkyl,         -halo, and —C(halo)₃, and which bridge optionally contains         —HC═CH— or —O— within the (C₂-C₆)bridge; wherein the A-B bridge         can be in the endo- or exo-configuration with respect to the         6-membered, nitrogen-containing ring that is fused to the Q         group; or     -   (d) A-B can together form a —CH₂—N(R_(a))—CH₂— bridge, a

wherein the A-B bridge can be in the endo- or exo-configuration with respect to the 6-membered, nitrogen-containing ring that is fused to the Q group;

R_(a) is —H, —(C₁-C₆)alkyl, —(C₃-C₇)cycloalkyl, —CH₂—C(═O)—R_(c), —(CH₂)—C(═O)—OR_(c), —(CH₂)—C(═O)—N(R_(c))₂, —(CH₂)₂—O—R_(c), —(CH₂)₂—S(═O)₂—N(R_(c))₂, R_(c), or —(CH₂)₂—N(R_(c))S(═O)₂—R_(c);

R_(b) is selected from:

-   -   (a) —H, —(C₁-C₆)alkyl, —(C₃-C₇)cycloalkyl, -(3- to         7-membered)heterocycle, —N(R_(c))₂, —N(R_(c))—(C₃-C₇)cycloalkyl,         and —N(R_(c))-(3- to 7-membered)heterocycle; and     -   (b) -phenyl, -naphthalenyl, and -(5- or 6-membered)heteroaryl,         each of which is unsubstituted or substituted with 1, 2, or 3         independently selected R₇ groups; and     -   (c) —N(R_(c))-phenyl, —N(R_(c))-naphthalenyl,         —N(R_(c))—(C₁₄)aryl, and —N(R_(c))-(5- to         10-membered)heteroaryl, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₇ groups;

each R_(c) is independently —H or —(C₁-C₄)alkyl;

Z is —[(C₁-C₁₀)alkyl optionally substituted by R₁₃]_(h)—, wherein h is 0 or 1; or —[(C₂-C₁₀)alkenyl optionally substituted by R₁₃]—; or —(C₁-C₁₀)alkyl-N(R₆)C(═Y)—, wherein Y is O or S;

R₁ is selected from:

-   -   (a) —H, -halo, —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂,         —S(═O)NH₂, —S(═O)₂NH₂, —C(═O)OV₁, and —C(═O)CN; and     -   (b) —(C₁-C₁₀)alkyl, —(C₂-C₁₀)alkenyl, —(C₂-C₁₀)alkynyl,         —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy, —(C₃-C₁₄)cycloalkyl,         —(C₆-C₁₄)bicycloalkyl, —(C₈-C₂₀)tricycloalkyl,         —(C₅-C₁₀)cycloalkenyl, —(C₇-C₁₄)bicycloalkenyl,         —(C₈-C₂₀)tricycloalkenyl, and -(3- to 7-membered)heterocycle,         each of which is unsubstituted or substituted with 1, 2, 3, or 4         independently selected R₈ groups; and     -   (c)

-   -    and     -   (d) -phenyl, -naphthalenyl, —(C₁₄)aryl, and -(5- to         10-membered)heteroaryl, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₇ groups; or

—Z—R₁ is 3,3-diphenylpropyl- optionally substituted at the 3 carbon of the propyl with —CN, —C(═O)N(R₆)₂, —C(═O)OV₁, or -tetrazolyl; or

—Z—R₁ is —(C₁-C₄)alkyl substituted with tetrazolyl;

each R₅ is independently —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), —CN, ═O, ═S, -halo, —N₃, —NO₂, —CH═N(R₉), —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)R₁₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)OR₉, —OC(═O)R₉, —OC(═O)OR₉, —S(═O)R₉, or —S(═O)₂R₉;

each R₆ is independently —H, —(C₁-C₆)alkyl, or —(C₃-C₇)cycloalkyl, or two R₆ groups attached to the same nitrogen atom can together form a 5- to 8-membered ring, wherein the number of atoms in the ring includes the nitrogen atom, and in which one of the 5- to 8-membered ring carbon atoms is optionally replaced by O, S, or N(T₃);

each R₇ is independently —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), —CN, -halo, —N₃, —NO₂, —CH═N(R₉), —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)R₁₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)N(T₁)(T₂), —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)N(T₁)(T₂), —C(═O)OR₉, —OC(═O)R₉, —OC(═O)N(T₁)(T₂), —OC(═O)OR₉, —S(═O)R₉, or —S(═O)₂R₉;

each R₈ is independently —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), —CN, ═O, ═S, -halo, —N₃, —NO₂, —CH═N(R₉), —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)R₁₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)N(T₁)(T₂), —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)N(T₁)(T₂), —C(═O)OR₉, —OC(═O)R₉, —OC(═O)N(T₁)(T₂), —OC(═O)OR₉, —S(═O)R₉, or —S(═O)₂R₉;

each R₉ is independently —H, —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, —(C₃-C₈)cycloalkyl, —(C₅-C₈)cycloalkenyl, -phenyl, -benzyl, -(3- to 7-membered)heterocycle, —C(halo)₃, —CH(halo)₂, or —CH₂(halo);

if h is 0, then R₁₁ can be —H, —CN, —C(═O)OR₉, or —C(═O)N(R₆)₂ or R₁₁ can be —(C₁-C₄)alkyl which is unsubstituted or substituted with —OH, —(C₁-C₄)alkoxy, —N(R₆)₂, —C(═O)OR₉, or —C(═O)N(R₆)₂;

if h is 1, then R₁₁ can be —H, —CN, —OH, -halo, —C(═O)OR₉, or —C(═O)N(R₆)₂ or R₁₁ can be —(C₁-C₄)alkyl which is unsubstituted or substituted with —OH, —(C₁-C₄)alkoxy, —N(R₆)₂, —C(═O)OR₉, or —C(═O)N(R₆)₂;

otherwise, wherein Z is —[(C₂-C₁₀)alkenyl optionally substituted by R₁₃]— or —(C₁-C₁₀)alkyl-N(R₆)C(═Y)—, then R₁₁ can be —H, —CN, —C(═O)OR₉, or —C(═O)N(R₆)₂ or R₁₁ can be —(C₁-C₄)alkyl which is unsubstituted or substituted with —OH, —(C₁-C₄)alkoxy, —N(R₆)₂, —C(═O)OR₉, or —C(═O)N(R₆)₂;

each R₁₂ is independently —H or —(C₁-C₄)alkyl;

R₁₃ is selected from:

-   -   (a) -halo, —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂,         —S(═O)NH₂, —S(═O)₂NH₂, —C(═O)OV₁, and —C(═O)CN; and     -   (b) —(C₁-C₁₀)alkyl, —(C₂-C₁₀)alkenyl, —(C₂-C₁₀)alkynyl,         —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy, —(C₅-C₁₀)cycloalkenyl, and         -(3- to 7-membered)heterocycle, each of which is unsubstituted         or substituted with 1, 2, 3, or 4 independently selected R₈         groups; and     -   (c)

-   -    and     -   (d) -phenyl and -(5- to 10-membered)heteroaryl, each of which is         unsubstituted or substituted with 1, 2, or 3 independently         selected R₇ groups;

R₁₄ is —H, —CN, —OH, -halo, —C(═O)OR₉, or —C(═O)N(R₆)₂ or R₁₄ can be —(C₁-C₄)alkyl which is unsubstituted or substituted with —OH, —(C₁-C₄)alkoxy, —N(R₆)₂, —C(═O)OR₉, or —C(═O)N(R₆)₂;

m is an integer selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11;

n is an integer selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9;

e and f are each an integer independently selected from 0, 1, 2, 3, 4, and 5 provided that 2≦(e+f)≦5;

each p is an integer independently selected from 0, 1, 2, 3, and 4;

each T₁ and T₂ is independently —H or —(C₁-C₁₀)alkyl which is unsubstituted or

substituted with 1, 2, or 3 independently selected R₅ groups and, optionally, in which any —(C₁-C₁₀)alkyl carbon atom except the carbon atom bonded directly to the atom to which T₁ or T₂ is attached is independently replaced by O, S, or N(R₆), or T₁ and T₂ can together form a 5- to 8-membered ring wherein the number of atoms in the ring includes the nitrogen atom to which T₁ and T₂ are bonded, said 5- to 8-membered ring is unsubstituted or substituted with 1, 2, or 3 independently selected R₅ groups and, optionally, any carbon atom in said 5- to 8-membered ring is independently replaced by O, S, or N(R₆);

each T₃ is independently —H or —(C₁-C₁₀)alkyl which is unsubstituted or substituted with 1, 2, or 3 independently selected R₅ groups and, optionally, in which any —(C₁-C₁₀)alkyl carbon atom except the carbon atom bonded directly to the atom to which T₃ is attached is independently replaced by O, S, or N(R₁₂);

each V₁ is independently —H, —(C₁-C₆)alkyl, —(C₃-C₇)cycloalkyl, -phenyl, or benzyl; and

each halo is independently —F, —Cl, —Br, or —I.

(2) The compound of the above (1), wherein Y₁ is O.

(3) The compound of any one of the above (1) or (2), wherein R₁ is selected from:

-   -   (a) -halo, —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂,         —S(═O)NH₂, —S(═O)₂NH₂, —C(═O)OV₁, and —C(═O)CN; and     -   (b) —(C₁-C₁₀)alkyl, —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy,         —(C₃-C₁₄)cycloalkyl, —(C₆-C₁₄)bicycloalkyl,         —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl,         —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, and -(3- to         7-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, 3, or 4 independently selected R₈ groups;         and     -   (c)

-   -    and     -   (d) -phenyl, -naphthalenyl, —(C₁₄)aryl, and -(5- to         10-membered)heteroaryl, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₇ groups.

(4) The compound of any one of the above (1) to (3), wherein Q is benzo, pyridino, pyrimidino, pyrazino, or pyridazino, and preferably Q is benzo or pyridino, wherein preferably the 2- and 3-positions of the pyridino are fused to the 6-membered, nitrogen-containing ring.

(5) The compound of any one of the above (1) to (4), wherein Q is benzo.

(6) The compound of any one of the above (1) to (5), wherein a is 0.

(7) The compound of any one of the above (1) to (6), wherein:

each R₃ is independently selected from:

-   -   (a) -halo, —CN, —OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂T₃,         —N(T₁)(T₂), and —N(T₃)C(═O)T₃, and —N(T₃)C(═O)OT₃; and     -   (b) —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl,         —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, and -(5- or         6-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₈ groups;

b is an integer selected from 1 and 2;

A-B together form a (C₂-C₆)bridge, which is unsubstituted or substituted with 1, 2, 3, 4, 5, 6, 7 or 8 substituents independently selected from —OH, —(C₁-C₄)alkyl, -halo, and —C(halo)₃, and which bridge optionally contains —HC═CH— or —O— within the (C₂-C₆)bridge; wherein the A-B bridge can be in the endo- or exo-configuration with respect to the 6-membered, nitrogen-containing ring that is fused to the Q group;

Z is —[(C₁-C₁₀)alkyl optionally substituted by R₁₃]_(h)—, wherein h is 0 or 1;

R₁ is selected from:

-   -   (a) —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂, —S(═O)NH₂,         —S(═O)₂NH₂, —C(═O)OV₁, and —C(═O)CN; and     -   (b) —(C₁-C₁₀)alkyl, —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy,         —(C₃-C₁₄)cycloalkyl, —(C₆-C₁₄)bicycloalkyl,         —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl,         —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, and -(3- to         7-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, 3, or 4 independently selected R₈ groups;         and     -   (c)

-   -    and     -   (d) -phenyl and -(5- to 10-membered)heteroaryl, each of which is         unsubstituted or substituted with 1, 2, or 3 independently         selected R₇ groups; and

R₁₃ is selected from:

-   -   (a) -halo, —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂,         —S(═O)NH₂, —S(═O)₂NH₂, —C(═O)OV₁, and —C(═O)CN; and     -   (b) —(C₁-C₁₀)alkyl, —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy, and         -(3- to 7-membered)heterocycle, each of which is unsubstituted         or substituted with 1, 2, 3, or 4 independently selected R₈         groups; and     -   (c)

-   -    and     -   (d) -phenyl and -(5- to 10-membered)heteroaryl, each of which is         unsubstituted or substituted with 1, 2, or 3 independently         selected R₇ groups.

(8) The compound of any one of the above (1) to (7), wherein each R₃ is independently selected from:

-   -   (a) -halo, —OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —N(T₁)(T₂),         —N(T₃)C(═O)T₃, and —N(T₃)C(═O)OT₃; and     -   (b) —(C₁-C₆)alkyl, —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, and -(5-         or 6-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₈ groups.     -   (9) The compound of any one of the above (1) to (8), wherein         each R₃ is independently selected from:         -   (a) —C(═O)OT₃, —C(═O)N(T₁)(T₂), —N(T₃)C(═O)T₃, and             —N(T₁)(T₂); and         -   (b) —(C₁-C₄)alkyl, —(C₁-C₄)alkoxy, —(C₃-C₇)cycloalkyl, and             -(5- or 6-membered)heterocycle, each of which is             unsubstituted or substituted with 1, 2, or 3 independently             selected R₈ groups.

(10) The compound of any one of the above (1) to (7), wherein each R₃ is independently selected from:

-   -   (a) -halo, —CN, —OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂T₃,         —N(T₁)(T₂), and —N(T₃)C(═O)T₃; and     -   (b) —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, and         —(C₁-C₆)alkoxy, each of which is unsubstituted or substituted         with 1, 2, or 3 independently selected R₈ groups.

(11) The compound of any one of the above (1) to (8) and (10), wherein each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃, OT₃, —N(T₃)C(═O)T₃, —C(═O)N(T₁)(T₂), and         —N(T₁)(T₂); and     -   (b) —(C₁-C₆)alkyl which is unsubstituted or substituted with 1         or 2 independently selected R₈ groups.

(12) The compound of any one of the above (1) to (11), wherein each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃ wherein the T₃ of said —C(═O)OT₃ is —H or         —(C₁-C₄)alkyl; and     -   (b) —(C₁-C₃)alkyl, each of which is unsubstituted or substituted         with 1 or 2 independently selected R₈ groups;     -   (c) —N(T₁)(T₂), wherein T₁ is hydrogen and T₂ is hydrogen or         —(C₁-C₁₀)alkyl which alkyl is unsubstituted or substituted with         1 or 2 independently selected R₅ groups;     -   (d) —OT₃, wherein T₃ is —H or —(C₁-C₄)alkyl; or     -   (e) —N(T₃)C(═O)T₃, wherein T₃ is —H or —(C₁-C₄)alkyl.

(13) The compound of any one of the above (1) to (12), wherein each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃ wherein the T₃ of said —C(═O)OT₃ is —H or         —(C₁-C₄)alkyl;     -   (b) —(C₁-C₃)alkyl, each of which is unsubstituted or substituted         with 1 or 2 independently selected R₈ groups; or     -   (c) —N(T₁)(T₂), wherein T₁ is hydrogen and T₂ is hydrogen or         —(C₁-C₁₀)alkyl which alkyl is unsubstituted or substituted with         1 or 2 independently selected R₅ groups.

(14) The compound of any one of the above (1) to (13), wherein each R₃ is independently selected from —C(═O)OH, —CH₂—C(═O)OH, —NH₂, —N(H)CH₃, —N(CH₃)₂, —N(H)C(O)CH₃, —OCH₃, and —CH₃.

(15) The compound of any one of the above (1) to (14), wherein each R₃ is independently selected from —C(═O)OH, —CH₂—C(═O)OH, —NH₂, N(H)CH₃, or N(CH₃)₂.

(16) The compound of any one of the above (1) to (15), wherein b is 1 or 2.

(17) The compound of any one of the above (1) to (16), wherein b is 1.

(18) The compound of any one of the above (1) to (16), wherein b is 2.

(19) The compound of any one of the above (1) to (16) and (18), wherein the two R₃ groups are attached to the same carbon atom of the azetidine-ring.

(20) The compound of any one of the above (1) to (16) and (18), wherein the two R₃ groups are attached to different carbon atoms of the azetidine-ring.

(21) The compound of any one of the above (1) to (17), which is:

or a pharmaceutically acceptable derivative thereof, and the compound preferably is:

or a pharmaceutically acceptable salt thereof.

(22) The compound of any one of the above (1) to (17), and (21), which is:

or a pharmaceutically acceptable derivative thereof, and the compound preferably is:

or a pharmaceutically acceptable salt thereof.

(23) The compound of any one of the above (1) to (17), (21), and (22) which is:

or a pharmaceutically acceptable derivative thereof, and the compound preferably is:

or a pharmaceutically acceptable salt thereof.

(24) The compound of any one of the above (1) to (20), wherein h is 1.

(25) The compound of any one of the above (1) to (20) and (24), wherein Z is —(C₁-C₃)alkyl- optionally substituted by R₁₃.

(26) The compound of any one of the above (1) to (20), (24), and (25), wherein R₁₃ is absent.

(27) The compound of any one of the above (1) to (20) and (24) to (26), wherein R₁₃ is absent and Z is —CH₂—CH₂—.

(28) The compound of any one of the above (1) to (20) and (24) to (27), wherein —Z—R₁ is:

wherein each R_(z) is independently —H, —(C₁-C₄)alkyl, —OH, or —CN and preferably each R_(z) is independently —H, —CH₃, or —CH₂CH₃.

(29) The compound of any one of the above (1) to (20), wherein h is 0.

(30) The compound of any one of the above (1) to (6), (8) to (20), and (24) to (29), wherein A and B are independently —H or —(C₁-C₆)alkyl and preferably A and B are each —H or A is —H and B is —CH₃.

(31) The compound of any one of the above (1) to (29), wherein A and B together form a bridge such that the bridged-piperidine is:

wherein each R_(d) is independently —H, —(C₁-C₄)alkyl, -halo, or —C(halo)₃.

(32) The compound of any one of the above (1) to (29) and (31), wherein A and B together form a bridge such that the bridged-piperidine is:

(33) The compound of any one of the above (1) to (29), (31), and (32), wherein A and B together form a bridge such that the bridged-piperidine is:

(34) The compound of any one of the above (1) to (29) and (31) to (33), wherein the A-B bridge of the bridged-piperidine is in the endo-configuration with respect to the 6-membered, nitrogen-containing ring that is fused to the Q group.

(35) The compound of any one of the above (1) to (20) and (29) to (34), wherein:

-   -   (a) h is 0;     -   (b) R₁ is —(C₁-C₁₀)alkyl, —(C₃-C₁₄)cycloalkyl,         —(C₃-C₁₄)cycloalkenyl, —(C₆-C₁₄)bicycloalkyl,         —(C₇-C₁₄)bicycloalkenyl, or —(C₈-C₂₀)tricycloalkyl, each of         which is unsubstituted or substituted with 1, 2, 3, or 4         independently selected R₈ groups and preferably R₁ is         —(C₃-C₁₄)cycloalkyl, —(C₃-C₁₄)cycloalkenyl,         —(C₆-C₁₄)bicycloalkyl, —(C₇-C₁₄)bicycloalkenyl, or         —(C₈-C₂₀)tricycloalkyl, each of which is unsubstituted or         substituted with 1, 2, 3, or 4 independently selected R₈ groups;         and     -   (c) each R₈ is independently —(C₁-C₄)alkyl,         —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉,         —C(halo)₃, —CH(halo)₂, —CH₂(halo), -halo, —N(R₉)₂,         —C(═O)N(T₁)(T₂), or —C(═O)OR₉.

(36) The compound of any one of the above (1) to (20) and (29) to (35), wherein —Z—R₁ is:

wherein each R_(z) is independently —H, —(C₁-C₄)alkyl, —OH, or —CN and preferably each R_(z) is independently —H, —CH₃, or —CH₂CH₃.

(37) The compound of any one of the above (1) to (20) and (29) to (35), wherein —Z—R₁ is:

(38) The compound of any one of the above (1) to (20) and (29) to (36), wherein —Z—R₁ is:

wherein R_(z) is —H, —CH₃, or —CH₂CH₃.

(39) The compound of any one of the above (1) to (5), (8) to (20), and (24) to (38), wherein a is 1 and R₂ is -halo, preferably R₂ is —F.

(40) The compound of any one of the above (1) to (20), (29), and (31) to (39), wherein the R₁ group is in the exo-configuration with respect to the A-B bridge of the bridged piperidine.

(41) The compound of any one of the above (1) to (20), (24) to (29), (31), and (34), wherein the compound is:

wherein M₁ is:

and

M₂ is:

or a pharmaceutically acceptable derivative thereof.

(42) The compound of any one of the above (1) to (20), (24) to (29), (31), (32), (34), and (41), wherein the compound is:

wherein M₁ is:

and

M₂ is:

or a pharmaceutically acceptable derivative thereof.

(43) The compound of the above (41) or (42), wherein the compound is:

or a pharmaceutically acceptable derivative thereof, and the compound preferably is:

or a pharmaceutically acceptable derivative thereof.

(44) A compound which is:

or a pharmaceutically acceptable derivative thereof.

(45) The compound of the above (44), which is:

or a pharmaceutically acceptable derivative thereof.

(46) The compound of any one of the above (1) to (45) or a pharmaceutically acceptable derivative thereof, which is radiolabeled.

(47) The compound of any one of the above (1) to (46), wherein the pharmaceutically acceptable derivative is a pharmaceutically acceptable salt, preferably a hydrochloride-salt, a sodium-salt, a potassium-salt, or a para-toluenesulfonic acid-salt.

(48) The compound of any one of the above (1) to (47), wherein the % de of the compound is at least about 95%.

(49) The compound of any one of the above (1) to (48), wherein the % de of the compound is at least about 99%.

(50) A composition comprising an effective amount of the compound or a pharmaceutically acceptable derivative of the compound of any one of the above (1) to (49) and a pharmaceutically acceptable carrier or excipient.

(51) A method for preparing a composition, comprising the step of admixing a compound or a pharmaceutically acceptable derivative of the compound of any one of the above (1) to (49) and a pharmaceutically acceptable carrier or excipient.

(52) A method for modulating ORL-1 receptor function in a cell, comprising contacting a cell capable of expressing the ORL-1 receptor with an effective amount of the composition or the compound or a pharmaceutically acceptable derivative of the compound of any one of the above (1) to (50).

(53) The method of the above (52), wherein the composition or the compound or the pharmaceutically acceptable derivative of the compound acts as an agonist at the ORL-1 receptor.

(54) The method of the above (52), wherein the composition or the compound or the pharmaceutically acceptable derivative of the compound acts as a partial agonist at the ORL-1 receptor.

(55) The method of the above (52), wherein the composition or the compound or the pharmaceutically acceptable derivative of the compound acts as an antagonist at the ORL-1 receptor.

(56) A method for treating or preventing pain in an animal, comprising administering to an animal in need thereof an effective amount of the composition or the compound or a pharmaceutically acceptable derivative of the compound of any one of the above (1) to (50).

(57) A method for treating or preventing a memory disorder, obesity, constipation, depression, dementia, Parkinsonism, anxiety, cough, diarrhea, high blood pressure, epilepsy, anorexia/cachexia, urinary incontinence, or drug abuse in an animal, comprising administering to an animal in need thereof an effective amount of the composition or the compound or a pharmaceutically acceptable derivative of the compound of any one of the above (1) to (50).

(58) Use of a compound or the pharmaceutically acceptable derivative of the compound of any one of the above (1) to (49) for the manufacture of a medicament useful for treating or preventing pain, a memory disorder, obesity, constipation, depression, dementia, Parkinsonism, anxiety, cough, diarrhea, high blood pressure, epilepsy, anorexia/cachexia, urinary incontinence, or drug abuse.

(59) The use of the above (58), wherein the condition is pain.

(60) The compound or the pharmaceutically acceptable derivative of the compound of any one of the above (1) to (49) for use in the treatment or prevention of pain, a memory disorder, obesity, constipation, depression, dementia, Parkinsonism, anxiety, cough, diarrhea, high blood pressure, epilepsy, anorexia/cachexia, urinary incontinence, or drug abuse.

(61) The compound for use of the above (60), wherein the condition is pain.

(62) A kit, comprising a container containing an effective amount of the composition or the compound or a pharmaceutically acceptable derivative of the compound of any one of the above (1) to (50).

4.1 AZETIDINE-SUBSTITUTED QUINOXALINE-TYPE PIPERIDINE COMPOUNDS OF FORMULA (I)

As stated above, the disclosure encompasses Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I):

or a pharmaceutically acceptable derivative thereof where R₁, R₂, R₃, Q, Y₁, Z, A, B, a, and b are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds.

In one embodiment, Y₁ is O. In another embodiment, Y₁ is S.

In another embodiment, a is 0 or 1. In another embodiment, a is 0. In another embodiment, a is 1. In another embodiment, a is 2.

In another embodiment, each R₂ is independently -halo, —OH, —NH₂, —CN, —(C₁-C₆)alkyl, —(C₃-C₇)cycloalkyl, -(5- or 6-membered)heterocycle, -phenyl, -naphthalenyl, or -(5- or 6-membered)heteroaryl.

In another embodiment, a is 1 and R₂ is -halo, —OH, —NH₂, —CN, —(C₁-C₆)alkyl, —(C₃-C₇)cycloalkyl, -(5- or 6-membered)heterocycle, -phenyl, -naphthalenyl, or -(5- or 6-membered)heteroaryl. In another embodiment, a is 1 and R₂ is -halo, —OH, —NH₂, —CN, methyl, ethyl, n-propyl, iso-propyl, cyclopentyl, cyclohexyl, cycloheptyl, or phenyl. In another embodiment, a is 1 and R₂ is -halo. In another embodiment, a is 1 and R₂ is —F or —Cl. In another embodiment, a is 1 and R₂ is —F. In another embodiment, a is 1 and R₂ is —Cl.

In another embodiment, a is 2 and each R₂ is independently -halo, —OH, —NH₂, —CN, —(C₁-C₆)alkyl, —(C₃-C₇)cycloalkyl, -(5- or 6-membered)heterocycle, -phenyl, -naphthalenyl, or -(5- or 6-membered)heteroaryl. In another embodiment, a is 2 and each R₂ is independently -halo, —OH, —NH₂, —CN, methyl, ethyl, n-propyl, iso-propyl, cyclopentyl, cyclohexyl, cycloheptyl, or phenyl. In another embodiment, a is 2 and each R₂ is -halo. In another embodiment, a is 2 and each R₂ is —F or —Cl. In another embodiment, a is 2 and each R₂ is —F. In another embodiment, a is 2 and each R₂ is —Cl.

In another embodiment, Q is benzo, pyridino, pyrimidino, pyrazino, pyridazino, pyrrolino, imidazolino, pyrazolino, triazolino, furano, oxazolino, isoxazolino, oxadiazolino, thiopheno, thiazolino, isothiazolino, or thiadiazolino. In another embodiment, Q is benzo, pyrrolino, imidazolino, pyrazolino, triazolino, furano, oxazolino, isoxazolino, oxadiazolino, thiopheno, thiazolino, isothiazolino, or thiadiazolino. In another embodiment, Q is benzo, imidazolino, pyrazolino, triazolino, oxazolino, isoxazolino, oxadiazolino, thiazolino, isothiazolino, or thiadiazolino. In another embodiment, Q is benzo, pyrrolino, imidazolino, pyrazolino, or triazolino. In another embodiment, Q is benzo, furano, oxazolino, isoxazolino, or oxadiazolino. In another embodiment, Q is benzo, oxazolino, isoxazolino, or oxadiazolino. In another embodiment, Q is benzo, thiopheno, thiazolino, isothiazolino, or thiadiazolino. In another embodiment, Q is benzo, thiazolino, isothiazolino, or thiadiazolino. In another embodiment, Q is benzo, pyrrolino, furano, or thiopheno. In another embodiment, Q is pyridino, pyrimidino, pyrazino, pyridazino, pyrrolino, imidazolino, pyrazolino, triazolino, furano, oxazolino, isoxazolino, oxadiazolino, thiopheno, thiazolino, isothiazolino, or thiadiazolino. In another embodiment, Q is pyrrolino, imidazolino, pyrazolino, triazolino, furano, oxazolino, isoxazolino, oxadiazolino, thiopheno, thiazolino, isothiazolino, or thiadiazolino. In another embodiment, Q is imidazolino, pyrazolino, triazolino, oxazolino, isoxazolino, oxadiazolino, thiazolino, isothiazolino, or thiadiazolino. In another embodiment, Q is pyrrolino, imidazolino, pyrazolino, or triazolino. In another embodiment, Q is furano, oxazolino, isoxazolino, or oxadiazolino. In another embodiment, Q is oxazolino, isoxazolino, or oxadiazolino. In another embodiment, Q is thiopheno, thiazolino, isothiazolino, or thiadiazolino. In another embodiment, Q is thiazolino, isothiazolino, or thiadiazolino. In another embodiment, Q is pyrrolino, furano, or thiopheno. In another embodiment, Q is benzo, pyridino, pyrimidino, pyrazino, or pyridazino. In another embodiment, Q is benzo, pyrimidino, pyrazino, or pyridazino. In another embodiment, Q is pyridino, pyrimidino, pyrazino, or pyridazino. In another embodiment, Q is pyrimidino, pyrazino, or pyridazino. In another embodiment, Q is benzo or pyridino. In another embodiment, Q is benzo. In another embodiment, Q is pyridino.

In another embodiment, a is 1, Q is benzo or pyridino, and R₂ is attached at the position shown below, denoted for purposes of the R₂-attachment-position herein as the “6-position”, of the benzo or pyridino, e.g., as illustrated below:

In another embodiment, a is 1, Q is benzo or pyridino, R₂ is -halo, and R₂ is attached at the 6-position of the benzo or pyridino as illustrated immediately above. In another embodiment, a is 1, Q is benzo or pyridino, R₂ is —F or —Cl, and R₂ is attached at the 6-position of the benzo or pyridino as illustrated immediately above. In another embodiment, a is 1, Q is benzo or pyridino, R₂ is —F, and R₂ is attached at the 6-position of the benzo or pyridino as illustrated immediately above.

In another embodiment, Q is benzo. In another embodiment, Q is pyridino. In another embodiment, Q is pyridino and the 2- and 3-positions of the pyridino are fused to the 6-membered, nitrogen-containing ring as illustrated, inter alia, for compounds according to Formula (IB) in Table 1, and the like. In another embodiment, Q is pyridino and the 2- and 3-positions of the pyridino are fused to the 6-membered, nitrogen-containing ring as illustrated, inter alia, for compounds according to Formula (IC) in Table 1, and the like.

In another embodiment, b is 0 or 1. In another embodiment, b is 0. In another embodiment, b is 1. In another embodiment, b is 2.

In another embodiment, each R₃ is independently selected from -halo, —CN, —NO₂, —OT₃, —C(═O)T₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂OT₃, —S(═O)T₃, —S(═O)₂T₃, —O—S(═O)₂T₃, —S(═O)₂N(T₁)(T₂), —N(T₁)(T₂), —N(T₃)C(═O)T₃, —N(T₃)C(═O)N(T₁)(T₂), —N(T₃)S(═O)T₃, —N(T₃)S(═O)₂T₃, —N(T₃)C(═O)OT₃, and —N(T₃)S(═O)₂N(T₁)(T₂). In another embodiment, each R₃ is independently selected from -halo, —CN, —OT₃, —C(═O)T₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂OT₃, —S(═O)T₃, —S(═O)₂T₃, —O—S(═O)₂T₃, —S(═O)₂N(T₁)(T₂), —N(T₁)(T₂), —N(T₃)C(═O)T₃, —N(T₃)C(═O)N(T₁)(T₂), —N(T₃)S(═O)T₃, —N(T₃)S(═O)₂T₃, —N(T₃)C(═O)OT₃, and —N(T₃)S(═O)₂N(T₁)(T₂). In another embodiment, each R₃ is independently selected from -halo, —CN, —OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂OT₃, —S(═O)T₃, —S(═O)₂T₃, —N(T₁)(T₂), —N(T₃)C(═O)T₃, —N(T₃)C(═O)N(T₁)(T₂), —N(T₃)S(═O)₂T₃, and —N(T₃)C(═O)OT₃. In another embodiment, each R₃ is independently selected from -halo, —OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —N(T₁)(T₂), —N(T₃)C(═O)T₃, and —N(T₃)C(═O)OT₃. In another embodiment, each R₃ is independently selected from —S(═O)₂OT₃, —S(═O)T₃, —S(═O)₂T₃, —O—S(═O)₂T₃, —S(═O)₂N(T₁)(T₂), —N(T₃)S(═O)T₃, —N(T₃)S(═O)₂T₃, and —N(T₃)S(═O)₂N(T₁)(T₂). In another embodiment, each R₃ is independently selected from —C(═O)OT₃, —C(═O)N(T₁)(T₂), and —N(T₃)C(═O)N(T₁)(T₂). In another embodiment, each R₃ is independently selected from —C(═O)OT₃ and —C(═O)N(T₁)(T₂). In another embodiment, each R₃ is independently selected from —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or —(C₁-C₆)alkyl. In another embodiment, each R₃ is independently selected from —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or —(C₁-C₄)alkyl. In another embodiment, each R₃ is independently selected from —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or —(C₁-C₃)alkyl. In another embodiment, each R₃ is independently selected from —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or —(C₁-C₂)alkyl. In another embodiment, each R₃ is independently selected from —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or —CH₃. In another embodiment, each R₃ is —C(═O)OH. In another embodiment, each R₃ is —C(═O)OCH₃. In another embodiment, each R₃ is independently selected from —N(T₁)(T₂) and —C(═O)N(T₁)(T₂). In another embodiment, each R₃ is independently selected from —N(T₁)(T₂) and —N(T₃)C(═O)OT₃.

In another embodiment, each R₃ is independently selected from —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, —(C₆-C₁₄)bicycloalkyl, —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl, —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, -(5- or 6-membered)heterocycle, and -(7- to 10-membered)bicycloheterocycle, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₈ groups. In another embodiment, each R₃ is independently selected from —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, —(C₅-C₁₀)cycloalkenyl, and -(5- or 6-membered)heterocycle, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₈ groups. In another embodiment, each R₃ is independently selected from —(C₁-C₆)alkyl, —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, and -(5- or 6-membered)heterocycle, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₈ groups. In another embodiment, each R₃ is independently selected from —(C₁-C₆)alkyl, —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, and -(5- or 6-membered)heterocycle, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₈ groups. In another embodiment, each R₃ is independently selected from —(C₁-C₄)alkyl, —(C₁-C₄)alkoxy, —(C₃-C₇)cycloalkyl, and -(5- or 6-membered)heterocycle, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₈ groups. In another embodiment, each R₃ is independently selected from —(C₁-C₄)alkyl, —(C₁-C₄)alkoxy, —(C₃-C₇)cycloalkyl, and -(5- or 6-membered)heterocycle, each of which is unsubstituted or substituted with 1 or 2 independently selected R₈ groups. In another embodiment, each R₃ is independently selected from —(C₁-C₄)alkyl and —(C₁-C₄)alkoxy, each of which is unsubstituted or substituted with 1 or 2 independently selected R₈ groups. In another embodiment, each R₃ is independently selected from —(C₁-C₃)alkyl, each of which is unsubstituted or substituted with 1 or 2 independently selected R₈ groups. In another embodiment, each R₃ is independently selected from —(C₁-C₂)alkyl, each of which is unsubstituted or substituted with 1 or 2 independently selected R₈ groups. In another embodiment, each R₃ is independently selected from —(C₁-C₂)alkyl, each of which is unsubstituted. In another embodiment, each R₃ is —CH₃. In another embodiment R₃ is C₁-alkyl substituted with one R₈ group. In another embodiment R₃ is C₁-alkyl substituted with COOH.

In another embodiment, each R₃ is independently selected from:

-   -   (a) -halo, —CN, —OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂OT₃,         —S(═O)T₃, —S(═O)₂T₃, —O—S(═O)₂T₃, —S(═O)₂N(T₁)(T₂), —N(T₁)(T₂),         —N(T₃)C(═O)T₃, —N(T₃)C(═O)N(T₁)(T₂), —N(T₃)S(═O)T₃,         —N(T₃)S(═O)₂T₃, —N(T₃)C(═O)OT₃, and —N(T₃)S(═O)₂N(T₁)(T₂); and     -   (b) —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₁-C₆)alkoxy,         —(C₃-C₇)cycloalkyl, —(C₅-C₁₀)cycloalkenyl, and -(5- or         6-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₈ groups.

In another embodiment, each R₃ is independently selected from:

-   -   (a) -halo, —OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂OT₃,         —S(═O)T₃, —S(═O)₂T₃, —S(═O)₂N(T₁)(T₂), —N(T₁)(T₂),         —N(T₃)C(═O)T₃, —N(T₃)C(═O)N(T₁)(T₂), —N(T₃)S(═O)T₃,         —N(T₃)S(═O)₂T₃, and —N(T₃)C(═O)OT₃; and     -   (b) —(C₁-C₆)alkyl, —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, and -(5-         or 6-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₈ groups.

In another embodiment, each R₃ is independently selected from:

-   -   (a) -halo, —OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —N(T₁)(T₂),         —N(T₃)C(═O)T₃, and —N(T₃)C(═O)OT₃; and     -   (b) —(C₁-C₆)alkyl, —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, and -(5-         or 6-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₈ groups.

In another embodiment, each R₃ is independently selected from:

-   -   (a) —S(═O)₂OT₃, —S(═O)T₃, —S(═O)₂T₃, —O—S(═O)₂T₃,         —S(═O)₂N(T₁)(T₂), —N(T₃)S(═O)T₃, —N(T₃)S(═O)₂T₃, and         —N(T₃)S(═O)₂N(T₁)(T₂); and     -   (b) —(C₁-C₆)alkyl, —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, and -(5-         or 6-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₈ groups.

In another embodiment, each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃, —C(═O)N(T₁)(T₂), and —N(T₃)C(═O)OT₃; and     -   (b) —(C₁-C₄)alkyl, —(C₁-C₄)alkoxy, —(C₃-C₇)cycloalkyl, and -(5-         or 6-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₈ groups.

In another embodiment, each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃, —C(═O)N(T₁)(T₂), and —N(T₁)(T₂); and     -   (b) —(C₁-C₄)alkyl, —(C₁-C₄)alkoxy, —(C₃-C₇)cycloalkyl, and -(5-         or 6-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₈ groups.

In another embodiment, each R₃ is independently selected from:

-   -   (a) —C(═O)N(T₁)(T₂) and —N(T₁)(T₂); and     -   (b) —(C₁-C₄)alkyl, —(C₁-C₄)alkoxy, —(C₃-C₇)cycloalkyl, and -(5-         or 6-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₈ groups.

In another embodiment, each R₃ is independently selected from:

-   -   (a) —N(T₁)(T₂) and —N(T₃)C(═O)OT₃; and     -   (b) —(C₁-C₄)alkyl, —(C₁-C₄)alkoxy, —(C₃-C₇)cycloalkyl, and -(5-         or 6-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₈ groups.

In another embodiment, each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or         —(C₁-C₆)alkyl; and     -   (b) —(C₁-C₄)alkyl, —(C₁-C₄)alkoxy, —(C₃-C₇)cycloalkyl, and -(5-         or 6-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₈ groups.

In another embodiment, each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or         —(C₁-C₄)alkyl; and     -   (b) —(C₁-C₃)alkyl, each of which is unsubstituted or substituted         with 1 or 2 independently selected R₈ groups.

In another embodiment, each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or         —(C₁-C₃)alkyl; and     -   (b) —(C₁-C₃)alkyl, each of which is unsubstituted or substituted         with 1 or 2 independently selected R₈ groups.

In another embodiment, each R₃ is independently selected from:

-   -   (a) C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or         —(C₁-C₂)alkyl; and     -   (b) —(C₁-C₃)alkyl, each of which is unsubstituted or substituted         with 1 or 2 independently selected R₈ groups.

In another embodiment, each R₃ is independently selected from —C(═O)OH, —CH₂—C(═O)OH, and —CH₃.

In another embodiment, each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or —CH₃; and     -   (b) —(C₁-C₂)alkyl, each of which is unsubstituted.

In another embodiment, each R₃ is independently selected from —C(═O)OCH₃ and —CH₃. In another embodiment, each R₃ is independently selected from —C(═O)OH and —CH₃.

In another embodiment, each R₃ is independently selected from:

-   -   (a) -halo, —CN, —OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂T₃,         —N(T₁)(T₂), and —N(T₃)C(═O)T₃; and     -   (b) —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, and         —(C₁-C₆)alkoxy, each of which is unsubstituted or substituted         with 1, 2, or 3 independently selected R₈ groups.

In another embodiment, each R₃ is independently selected from:

-   -   (a) —OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂T₃, —N(T₁)(T₂), and         —N(T₃)C(═O)T₃; and     -   (b) —(C₁-C₆)alkyl and —(C₁-C₆)alkoxy, each of which is         unsubstituted or substituted with 1, 2, or 3 independently         selected R₈ groups.

In another embodiment, each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃, —C(═O)N(T₁)(T₂), and —N(T₁)(T₂); and     -   (b) —(C₁-C₆)alkyl which is unsubstituted or substituted with 1         or 2 independently selected R₈ groups.

In another embodiment, b is 1 or 2 and R₃ is independently selected from:

-   -   (a) —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or         —(C₁-C₄)alkyl; and     -   (b) —(C₁-C₃)alkyl which is unsubstituted or substituted with 1         or 2 independently selected R₈ groups.

In another embodiment, b is 1 or 2 and each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or         —(C₁-C₃)alkyl; and     -   (b) —(C₁-C₃)alkyl which is unsubstituted or substituted with 1         or 2 independently selected R₈ groups.

In another embodiment, b is 1 or 2 and each R₃ is independently selected from:

-   -   (a) C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or         —(C₁-C₂)alkyl; and     -   (b) —(C₁-C₃)alkyl which is unsubstituted or substituted with 1         or 2 independently selected R₈ groups.

In another embodiment, b is 1 or 2 and each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or —CH₃; and     -   (b) —(C₁-C₂)alkyl which is unsubstituted.

In another embodiment, b is 1 or 2 and each R₃ is independently selected from:

-   -   (a) —OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂T₃, —N(T₁)(T₂), and         —N(T₃)C(═O)T₃; and     -   (b) —(C₁-C₆)alkyl and —(C₁-C₆)alkoxy, each of which is         unsubstituted or substituted with 1, 2, or 3 independently         selected R₈ groups.

In another embodiment, b is 1 or 2 and each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃, —C(═O)N(T₁)(T₂), and —N(T₁)(T₂); and     -   (b) —(C₁-C₆)alkyl which is unsubstituted or substituted with 1         or 2 independently selected R₈ groups.

In another embodiment, b is 2 and each R₃ is independently selected from —C(═O)OCH₃, —C(═O)OH, n-hexyl, n-butyl, n-propyl, iso-propyl, —CH₂CH₃, and —CH₃. In another embodiment, b is 2 and each R₃ is independently selected from —C(═O)OCH₃, —C(═O)OH, n-propyl, iso-propyl, —CH₂CH₃, and —CH₃. In another embodiment, b is 2 and each R₃ is independently selected from —C(═O)OCH₃, —C(═O)OH, iso-propyl, —CH₂CH₃, and —CH₃.

In another embodiment, b is 2 and each R₃ is independently selected from:

-   -   (a) —C(═O)OT₃, —C(═O)N(T₁)(T₂), and —OT₃; and     -   (b) —(C₁-C₆)alkyl which is unsubstituted or substituted with 1         or 2 independently selected R₈ groups.

In another embodiment, b is 2 and each R₃ is independently selected from —C(═O)OT₃ and —OT₃. In another embodiment, b is 2 and each R₃ is independently selected from —C(═O)OCH₃, —C(═O)OH, and —OCH₃. In another embodiment, when b is 2 and one R₃ is —C(═O)OT₃, the other R₃, if it is attached to the same azetidine ring carbon atom as the —C(═O)OT₃ group, is not —N(T₁)(T₂).

In another embodiment, b is 1 and R₃ is selected from:

-   -   (a) —OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂T₃, —N(T₁)(T₂), and         —N(T₃)C(═O)T₃; and     -   (b) —(C₁-C₆)alkyl and —(C₁-C₆)alkoxy, each of which is         unsubstituted or substituted with 1, 2, or 3 independently         selected R₈ groups.

In another embodiment, b is 1 and R₃ is selected from:

-   -   (a) —C(═O)OT₃, —C(═O)N(T₁)(T₂), and —N(T₁)(T₂); and     -   (b) —(C₁-C₆)alkyl which is unsubstituted or substituted with 1         or 2 independently selected R₈ groups.

In another embodiment, b is 1 and R₃ is selected from:

-   -   (a) —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or         —(C₁-C₄)alkyl; and     -   (b) —(C₁-C₃)alkyl which is unsubstituted or substituted with 1         or 2 independently selected R₈ groups.

In another embodiment, b is 1 and R₃ is selected from:

-   -   (a) —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or         —(C₁-C₃)alkyl; and     -   (b) —(C₁-C₃)alkyl which is unsubstituted or substituted with 1         or 2 independently selected R₈ groups.

In another embodiment, b is 1 and R₃ is selected from:

-   -   (a) C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or         —(C₁-C₂)alkyl; and     -   (b) —(C₁-C₃)alkyl which is unsubstituted or substituted with 1         or 2 independently selected R₈ groups.

In another embodiment, b is 1 and R₃ is selected from:

-   -   (a) —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or —CH₃; and     -   (b) —(C₁-C₂)alkyl which is unsubstituted.

In another embodiment, b is 1 and R₃ is selected from —C(═O)OCH₃ and —CH₃. In another embodiment, b is 1 and R₃ is selected from —C(═O)OH and —CH₃. In another embodiment, b is 1 and R₃ is —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or —(C₁-C₂)alkyl. In another embodiment, b is 1 and R₃ is —C(═O)OT₃ where the T₃ of said —C(═O)OT₃ is —H or —CH₃. In another embodiment, b is 1 and R₃ is —C(═O)OH. In another embodiment, b is 1 and R₃ is —C(═O)OCH₃. In another embodiment, b is 1 and R₃ is —(C₁-C₂)alkyl which is unsubstituted or substituted with 1 or 2 independently selected R₈ groups. In another embodiment, b is 1 and R₃ is —(C₁-C₂)alkyl which is unsubstituted. In another embodiment, b is 1 and R₃ is —CH₃.

In another embodiment, each R₈ is independently selected from —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), —CN, ═O, ═S, -halo, —NO₂, —CH═N(R₉), —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)R₁₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)N(T₁)(T₂), —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)N(T₁)(T₂), —C(═O)OR₉, —OC(═O)R₉, —S(═O)R₉, and —S(═O)₂R₉. In another embodiment, each R₈ is independently selected from —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), ═O, ═S, -halo, —CH═N(R₉), —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)R₁₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)N(T₁)(T₂), —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)N(T₁)(T₂), —C(═O)OR₉, —OC(═O)R₉, —S(═O)R₉, and —S(═O)₂R₉. In another embodiment, each R₈ is independently selected from —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), -halo, —CH═N(R₉), —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)N(T₁)(T₂), —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)N(T₁)(T₂), —C(═O)OR₉, —OC(═O)R₉, and —S(═O)₂R₉. In another embodiment, each R₈ is independently selected from —(C₁-C₄)alkyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), -halo, —N(R₉)₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)N(T₁)(T₂), —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)N(T₁)(T₂), —C(═O)OR₉, —OC(═O)R₉, and —S(═O)₂R₉. In another embodiment, each R₈ is independently selected from —(C₁-C₄)alkyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), -halo, —N(R₉)₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —C(═O)R₉, —C(═O)N(T₁)(T₂), —C(═O)OR₉, —OC(═O)R₉, and —S(═O)₂R₉. In another embodiment, each R₈ is independently selected from —(C₁-C₄)alkyl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), -halo, —N(R₉)₂, —C(═O)N(T₁)(T₂), and —C(═O)OR₉.

In another embodiment, each R₉ is independently —H, —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₃-C₈)cycloalkyl, -phenyl, -benzyl, -(3- to 7-membered)heterocycle, —C(halo)₃, —CH(halo)₂, or —CH₂(halo). In another embodiment, each R₉ is independently —H, —(C₁-C₆)alkyl, —(C₃-C₈)cycloalkyl, -phenyl, -benzyl, -(3- to 7-membered)heterocycle, —C(halo)₃, —CH(halo)₂, or —CH₂(halo). In another embodiment, each R₉ is independently —H, —(C₁-C₆)alkyl, —C(halo)₃, —CH(halo)₂, or —CH₂(halo). In another embodiment, each R₉ is independently —H or —(C₁-C₃)alkyl.

In another embodiment, each T₁ and T₂ is independently —H or —(C₁-C₃)alkyl which is unsubstituted or substituted with an independently selected R₅ group. In another embodiment, each T₁ and T₂ is independently —H or —(C₁-C₃)alkyl which is unsubstituted. In another embodiment, each T₁ and T₂ is independently —H or —CH₃. In another embodiment, each T₃ is independently —H or —(C₁-C₃)alkyl which is unsubstituted or substituted with an independently selected R₅ group. In another embodiment, each T₃ is independently —H or —(C₁-C₃)alkyl which is unsubstituted. In another embodiment, each T₃ is independently —H or —CH₃.

In another embodiment, each R₅ is independently selected from —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), —CN, ═O, ═S, -halo, —NO₂, —CH═N(R₉), —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)R₁₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)OR₉, —OC(═O)R₉, —S(═O)R₉, and —S(═O)₂R₉. In another embodiment, each R₅ is independently selected from —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), ═O, ═S, -halo, —CH═N(R₉), —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)R₁₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)OR₉, —OC(═O)R₉, —S(═O)R₉, and —S(═O)₂R₉. In another embodiment, each R₅ is independently selected from —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), -halo, —CH═N(R₉), —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)OR₉, —OC(═O)R₉, and —S(═O)₂R₉. In another embodiment, each R₅ is independently selected from —(C₁-C₄)alkyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), -halo, —N(R₉)₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)OR₉, —OC(═O)R₉, and —S(═O)₂R₉. In another embodiment, each R₅ is independently selected from —(C₁-C₄)alkyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), -halo, —N(R₉)₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —C(═O)R₉, —C(═O)OR₉, —OC(═O)R₉, and —S(═O)₂R₉. In another embodiment, each R₅ is independently selected from —(C₁-C₄)alkyl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), -halo, —N(R₉)₂, and —C(═O)OR₉.

In another embodiment, h is 0. In another embodiment, h is 1. In another embodiment, h is 1 and R₁₃ is absent. In another embodiment, h is 0 and R₁₁ is —H. In another embodiment, h is 1 and R₁₁ is —H.

In another embodiment, h is 1 and Z is —(C₁-C₃)alkyl optionally substituted by R₁₃. In another embodiment, h is 1, R₁₃ is absent, and Z is —CH₂—. In another embodiment, h is 1, R₁₃ is absent, and Z is —CH₂—CH₂—. In another embodiment, h is 1, R₁₃ is absent and Z is —CH₂—CH₂—CH₂—. In another embodiment, h is 1, Z is —(C₁-C₃)alkyl-, R₁ is phenyl, and the Z group (i.e., —(C₁-C₃)alkyl-) is substituted by R₁₃. In another embodiment, h is 1, Z is a —(C₁-C₃)alkyl-, R₁ is optionally-substituted phenyl, and the Z group is substituted by R₁₃ which is optionally-substituted phenyl. In another embodiment, h is 1, Z is a —(C₁-C₃)alkyl-, R₁ is unsubstituted phenyl, and the Z group is substituted by R₁₃ which is unsubstituted phenyl. In another embodiment, h is 1, Z is a —(C₁-C₃)alkyl-, and the Z group is substituted by R₁₃ which is —CF₃. In another embodiment, h is 1 and Z—R₁₃ is —CH₂—CH(CF₃)—CH₂—.

In another embodiment, R₁ is —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy, —(C₆-C₁₄)bicycloalkyl, —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl, —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, -(3- to 7-membered)heterocycle, or -(7- to 10-membered)bicycloheterocycle, each of which is unsubstituted or substituted with 1, 2, 3, or 4 independently selected R₈ groups.

In another embodiment, Z is —(C₂-C₁₀)alkenyl-. In another embodiment, Z is —(C₂-C₆)alkenyl-. In another embodiment, Z is —CH₂—CH═CH—. In another embodiment, Z is —CH₂—CH═CH—CH₂—. In another embodiment, Z is a —(C₃)alkenyl-. In another embodiment, Z is n-prop-1,3-diyl and R₁ is an optionally substituted —(C₆-C₁₄)bicycloalkyl or optionally substituted —(C₈-C₂₀)tricycloalkyl. In another embodiment, Z—R₁ is —CH₂—CH═R₁. In another embodiment, Z—R₁ is —CH₂—CH₂—CH═R₁ or —CH(CH₃)—CH═R₁ where R₁ is —(C₆-C₁₄)bicycloalkyl or —(C₈-C₂₀)tricycloalkyl, each of which is optionally substituted. In another embodiment, h is 1, and Z—R₁ is

In another embodiment, Y is O. In another embodiment, Y is S.

In another embodiment, Z is —CH₂—NH—C(═O)—. In another embodiment, Z is —CH₂—CH₂—NH—C(═O)—. In another embodiment, Z is —CH₂—NH—C(═S)—. In another embodiment, Z is —CH₂—CH₂—NH—C(═S)—. In another embodiment, Z is —CH₂—N(CH₃)—C(═O)—. In another embodiment, Z is —CH₂—CH₂—N(CH₃)—C(═O)—. In another embodiment, Z is —CH₂—N(CH₃)—C(═S)—. In another embodiment, Z is —CH₂—CH₂—N(CH₃)—C(═S)—.

In another embodiment, R₁ is selected from:

-   -   (a) -halo, —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂,         —S(═O)NH₂, —S(═O)₂NH₂, —C(═O)OV₁, and —C(═O)CN; and     -   (b) —(C₁-C₁₀)alkyl, —(C₂-C₁₀)alkenyl, —(C₂-C₁₀)alkynyl,         —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy, —(C₆-C₁₄)bicycloalkyl,         —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl,         —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, and -(3- to         7-membered)heterocycle, each of which is unsubstituted or         substituted with 1, 2, 3, or 4 independently selected R₈ groups;         and     -   (c)

-   -    and     -   (d) -phenyl, -naphthalenyl, —(C₁₄)aryl, and -(5- to         10-membered)heteroaryl, each of which is unsubstituted or         substituted with 1, 2, or 3 independently selected R₇ groups.

In another embodiment, R₁ is selected from:

-   -   (a) -halo, —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂,         —S(═O)NH₂, —S(═O)₂NH₂, —C(═O)OV₁, and —C(═O)CN; and     -   (b) —(C₁-C₁₀)alkyl, —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy,         —(C₆-C₁₄)bicycloalkyl, —(C₈-C₂₀)tricycloalkyl,         —(C₅-C₁₀)cycloalkenyl, —(C₇-C₁₄)bicycloalkenyl,         —(C₈-C₂₀)tricycloalkenyl, and -(3- to 7-membered)heterocycle,         each of which is unsubstituted or substituted with 1, 2, 3, or 4         independently selected R₈ groups; and     -   (c)

-   -    and     -   (d) -phenyl and -(5- to 10-membered)heteroaryl, each of which is         unsubstituted or substituted with 1, 2, or 3 independently         selected R₇ groups.

In another embodiment, m is 1, 2, 3, 4, 5, 6, 7, 8, or 9. In another embodiment, m is 2, 3, 4, 5, 6, 7, or 8. In another embodiment, m is 2, 3, 4, 5, 6, or 7. In another embodiment, m is 2, 3, 4, 5, or 6. In another embodiment, m is 2, 3, 4, or 5. In another embodiment, m is 2. In another embodiment, m is 3. In another embodiment, m is 4. In another embodiment, m is 5. In another embodiment, m is 6. In another embodiment, m is 7.

In another embodiment, n is 2, 3, 4, 5, 6, 7, or 8. In another embodiment, n is 2, 3, 4, 5, 6, or 7. In another embodiment, n is 2, 3, 4, 5, or 6. In another embodiment, n is 2, 3, 4, or 5. In another embodiment, n is 2. In another embodiment, n is 3. In another embodiment, n is 4. In another embodiment, n is 5. In another embodiment, n is 6. In another embodiment, n is 7.

In another embodiment, m is 1, 2, 3, 4, 5, 6, 7, 8, or 9 and n is 2, 3, 4, 5, 6, 7, or 8. In another embodiment, m is 2, 3, 4, 5, 6, 7, or 8 and n is 2, 3, 4, 5, 6, 7, or 8. In another embodiment, m is 2, 3, 4, 5, 6, or 7 and n is 2, 3, 4, 5, 6, or 7. In another embodiment, m is 2, 3, 4, 5, or 6 and n is 2, 3, 4, 5, or 6. In another embodiment, m is 2, 3, 4, or 5 and n is 2, 3, 4, or 5. In another embodiment, m=n. In another embodiment, m and n are each 2. In another embodiment, m and n are each 3. In another embodiment, m and n are each 4. In another embodiment, m and n are each 5. In another embodiment, m and n are each 6. In another embodiment, m and n are each 7.

In another embodiment, e is 0 and f is 0. In another embodiment, e is 0 and f is 1. In another embodiment, e is 1 and f is 0. In another embodiment, e is 1 and f is 1. In another embodiment, e is 1 and f is 2. In another embodiment, e is 2 and f is 1. In another embodiment, e is 2 and f is 2.

In another embodiment, R₁ is optionally substituted cyclooctyl. In another embodiment, R₁ is optionally substituted cyclooctenyl. In another embodiment, R₁ is optionally substituted anthryl.

In another embodiment, h is 0 and R₁ is optionally substituted cyclooctyl. In another embodiment, h is 0 and R₁ is optionally substituted cycloundecyl. In another embodiment, h is 0 and R₁ is optionally substituted cyclooctenyl. In another embodiment, h is 0 and R₁ is optionally substituted anthryl. In another embodiment, h is 0 and R₁ is optionally substituted —(C₆-C₁₄)bicycloalkyl. In another embodiment, h is 0 and R₁ is optionally substituted bicyclo[3.3.1]nonyl. In another embodiment, h is 0 and R₁ is optionally substituted bicyclo[2.2.1.]hepyl. In another embodiment, h is 0 and R₁ is optionally substituted —(C₈-C₂₀)tricycloalkyl. In another embodiment, h is 0 and R₁ is optionally substituted adamantyl. In another embodiment, h is 0 and R₁ is optionally substituted noradamantyl.

In another embodiment, Y₁ is O, A and B are each H, and a is 0 or 1. In another embodiment, Y₁ is S, A and B are each H, and a is 0 or 1. In another embodiment, Y₁ is O, A and B are each H, and a is 0. In another embodiment, Y₁ is S, A and B are each H, and a is 0. In another embodiment, Y₁ is O, A and B are each H, and a is 1. In another embodiment, Y₁ is S, A and B are each H, and a is 1.

In another embodiment, R₁₁ is —H. In another embodiment, R₁₁ is not —C(═O)OH.

In another embodiment, R₁₄ is —H. In another embodiment, R₁₄ is not —C(═O)OH.

In another embodiment, R₁₁ is —H and R₁₄ is —H. In another embodiment, R₁₁ is not —C(═O)OH and R₁₄ is not —C(═O)OH.

In another embodiment, Y₁ is O, A and B are each H, R₃ is absent, and a is 0 or 1. In another embodiment, Y₁ is S, A and B are each H, R₃ is absent, and a is 0 or 1. In another embodiment, Y₁ is O, A and B are each H, R₃ is absent, and a is 0. In another embodiment, Y₁ is S, A and B are each H, R₃ is absent, and a is 0. In another embodiment, Y₁ is O, A and B are each H, R₃ is absent, and a is 1. In another embodiment, Y₁ is S, A and B are each H, R₃ is absent, and a is 1.

In another embodiment, Y₁ is O, A and B are each H, R₃ is —H, —(C₁-C₄)alkyl, or —(C₃-C₇)cycloalkyl, and a is 0 or 1. In another embodiment, Y₁ is S, A and B are each H, R₃ is —H, —(C₁-C₄)alkyl, or —(C₃-C₇)cycloalkyl, and a is 0 or 1. In another embodiment, Y₁ is O, A and B are each H, R₃ is —H, —(C₁-C₄)alkyl, or —(C₃-C₇)cycloalkyl, and a is 0. In another embodiment, Y₁ is S, A and B are each H, R₃ is —H, —(C₁-C₄)alkyl, or —(C₃-C₇)cycloalkyl, and a is 0. In another embodiment, Y₁ is O, A and B are each H, R₃ is —H, —(C₁-C₄)alkyl, or —(C₃-C₇)cycloalkyl, and a is 1. In another embodiment, Y₁ is S, A and B are each H, R₃ is —H, —(C₁-C₄)alkyl, or —(C₃-C₇)cycloalkyl, and a is 1.

In another embodiment, A and B are independently selected from:

-   -   (a) —H, —CN, —C(═O)OT₃, and —C(═O)N(T₁)(T₂); and     -   (b) —(C₃-C₁₂)cycloalkyl, —(C₃-C₁₂)cycloalkoxy, —(C₁-C₆)alkyl,         —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, and —(C₁-C₆)alkoxy, each of         which is unsubstituted or substituted with 1 or 2 substituents         independently selected from —OH, —S(═O)₂NH₂, —N(R₆)₂, ═NR₆,         —C(═O)OT₃, —C(═O)N(R₆)₂, —N(R₆)C(═O)R₉, and -(5- or         6-membered)heterocycle, or 1, 2, or 3 independently selected         -halo; or     -   (c) A-B can together form a (C₂-C₆)bridge, which is         unsubstituted or substituted with 1, 2, 3, 4, 5, 6, 7 or 8         substituents independently selected from —OH, —(C₁-C₄)alkyl,         -halo, and —C(halo)₃, and which bridge optionally contains         —HC═CH— or —O— within the (C₂-C₆)bridge; wherein the 6-membered,         nitrogen-containing ring that is fused to the Q group can be in         the endo- or exo-configuration with respect to the A-B bridge.

In another embodiment, A is H. In another embodiment, B is H. In another embodiment, A is H and B is H.

In another embodiment, A-B together form a (C₂)bridge which bridge is substituted or unsubstituted. In another embodiment, A-B together form a (C₂)bridge which bridge is unsubstituted. In another embodiment, A-B together form a (C₂)bridge which bridge is substituted by one or two methyl groups. In another embodiment, A-B together form a (C₃)bridge which bridge is substituted or unsubstituted. In another embodiment, A-B together form a (C₃)bridge which bridge is unsubstituted. In another embodiment, A-B together form a (C₃)bridge which bridge is substituted by one or two methyl groups. In another embodiment, A-B together form a (C₃)bridge which bridge is substituted by one or two ethyl groups. In another embodiment, A-B together form a (C₄)bridge which bridge is substituted or unsubstituted. In another embodiment, A-B together form a (C₄)bridge which bridge is unsubstituted. In another embodiment, A-B together form a (C₄)bridge which bridge is substituted by one or two methyl groups. In another embodiment, A-B together form a (C₅)bridge which bridge is substituted or unsubstituted. In another embodiment, A-B together form a (C₅)bridge which bridge is unsubstituted. In another embodiment, A-B together form a (C₅)bridge which bridge is substituted by one or two methyl groups. In another embodiment, A-B together form a (C₆)bridge which bridge is substituted or unsubstituted. In another embodiment, A-B together form a (C₆)bridge which bridge is unsubstituted. In another embodiment, A-B together form a (C₆)bridge which bridge is substituted by one or two methyl groups.

In another embodiment, A-B together form a (C₂)bridge which bridge is —HC═CH— and is substituted or unsubstituted. In another embodiment, A-B together form a (C₂)bridge which bridge is —HC═CH— and is unsubstituted. In another embodiment, A-B together form a (C₂)bridge which is —HC═CH— and is substituted by one or two methyl groups. In another embodiment, A-B together form a (C₃)bridge which is —CH₂—HC═CH— or —HC═CH—CH₂— and is substituted or unsubstituted. In another embodiment, A-B together form a (C₃)bridge which is —CH₂—HC═CH— or —HC═CH—CH₂— and is unsubstituted. In another embodiment, A-B together form a (C₃)bridge which is —CH₂—HC═CH— or —HC═CH—CH₂— and is substituted by one or two methyl groups. In another embodiment, A-B together form a (C₄)bridge which is —CH₂—CH₂—HC═CH—, —CH₂—HC═CH—CH₂—, or —HC═CH—CH₂—CH₂— and is substituted or unsubstituted. In another embodiment, A-B together form a (C₄)bridge which is —CH₂—CH₂—HC═CH—, —CH₂—HC═CH—CH₂—, or —HC═CH—CH₂—CH₂— and is unsubstituted. In another embodiment, A-B together form a (C₄)bridge which is —CH₂—CH₂—HC═CH—, —CH₂—HC═CH—CH₂—, or —HC═CH—CH₂—CH₂— and is substituted by one or two methyl groups.

In another embodiment, A-B together form a (C₂)bridge which is —CH₂—O—CH₂— and is substituted or unsubstituted. In another embodiment, A-B together form a (C₂)bridge which is —CH₂—O—CH₂— and is unsubstituted. In another embodiment, A-B together form a (C₂)bridge which is —CH₂—O—CH₂— and is substituted by one or two methyl groups. In another embodiment, A-B together form a (C₃)bridge which is —CH₂—O—CH₂—CH₂— or —CH₂—CH₂—O—CH₂— and is substituted or unsubstituted. In another embodiment, A-B together form a (C₃)bridge which is —CH₂—O—CH₂—CH₂— or —CH₂—CH₂—O—CH₂— and is unsubstituted. In another embodiment, A-B together form a (C₃)bridge which is —CH₂—O—CH₂—CH₂— or —CH₂—CH₂—O—CH₂— and is substituted by one or two methyl groups. In another embodiment, A-B together form a (C₄)bridge which is —CH₂—O—CH₂—CH₂—CH₂—, —CH₂—CH₂—O—CH₂—CH₂—, or —CH₂—CH₂—CH₂—O—CH₂— and is substituted or unsubstituted. In another embodiment, A-B together form a (C₄)bridge which is —CH₂—O—CH₂—CH₂—CH₂—, —CH₂—CH₂—O—CH₂—CH₂—, or —CH₂—CH₂—CH₂—O—CH₂— and is unsubstituted. In another embodiment, A-B together form a (C₄)bridge which is —CH₂—O—CH₂—CH₂—CH₂—, —CH₂—CH₂—O—CH₂—CH₂—, or —CH₂—CH₂—CH₂—O—CH₂— and is substituted by one or two methyl groups.

In another embodiment, A-B together form a —CH₂—NH—CH₂— bridge. In another embodiment, A-B together form a —CH₂—N(CH₃)—CH₂— bridge. In another embodiment, A-B together form a —CH₂—N(cyclohexyl)-CH₂— bridge. In another embodiment, A-B together form a —CH₂—N(CH₂—CH₂—OH)—CH₂— bridge.

In another embodiment, A-B together form a

bridge. In another embodiment, A-B together form a

bridge. In another embodiment, A-B together form a

bridge. In another embodiment, A-B together form a

bridge.

In another embodiment, the Azetidine-Substituted Quinoxaline-Type Piperidine Compound is not

-   3-amino-1-(4-((1R,3R,5S)-9-((1R,6S,8s)-bicyclo[4.3.1]decan-8-yl)-9-azabicyclo[3.3.1]nonan-3-yl)-3-oxo-3,4-dihydroquinoxalin-2-yl)azetidine-3-carboxylic     acid, -   1-(4-((1R,3R,5S)-9-((1R,6S,8s)-bicyclo[4.3.1]decan-8-yl)-9-azabicyclo[3.3.1]nonan-3-yl)-3-oxo-3,4-     dihydroquinoxalin-2-yl)-3-(dimethylamino)azetidine-3-carboxylic     acid, -   (2S,3R)-1-(4-((1R,3R,5S)-9-((1R,6S,8s)-bicyclo[4.3.1]decan-8-yl)-9-azabicyclo[3.3.1]nonan-3-yl)-3-oxo-3,4-dihydroquinoxalin-2-yl)-3-(methylamino)azetidine-2-carboxylic     acid, -   (2S,3R)-1-(4-((1R,1′R,3r,3′R,5S,5′S)-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)-3-oxo-3,4-     dihydroquinoxalin-2-yl)-3-aminoazetidine-2-carboxylic acid, -   (2S,3R)-1-(4-((1R,1′R,3r,3′R,5S,5′S)-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)-3-oxo-3,4-     dihydroquinoxalin-2-yl)-3-(dimethylamino)azetidine-2-carboxylic     acid, or -   (2S,3R)-1-(4-((1R,1′R,3r,3′R,5S,5′S)-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)-3-oxo-3,4-     dihydroquinoxalin-2-yl)-3-acetamidoazetidine-2-carboxylic acid.

In another embodiment, the Azetidine-Substituted Quinoxaline-Type Piperidine Compound is not

-   3-amino-1-(4-((1R,3R,5S)-9-((1R,6S,8s)-bicyclo[4.3.1]decan-8-yl)-9-azabicyclo[3.3.1]nonan-3-yl)-3-oxo-3,4-dihydroquinoxalin-2-yl)azetidine-3-carboxylic     acid, -   1-(4-((1R,3R,5S)-9-((1R,6S,8s)-bicyclo[4.3.1]decan-8-yl)-9-azabicyclo[3.3.1]nonan-3-yl)-3-oxo-3,4-     dihydroquinoxalin-2-yl)-3-(dimethylamino)azetidine-3-carboxylic     acid, and -   (2S,3R)-1-(4-((1R,3R,5S)-9-((1R,6S,8s)-bicyclo[4.3.1]decan-8-yl)-9-azabicyclo[3.3.1]nonan-3-yl)-3-oxo-3,4-dihydroquinoxalin-2-yl)-3-(methylamino)azetidine-2-carboxylic     acid.

In another embodiment, the Azetidine-Substituted Quinoxaline-Type Piperidine Compound is not

-   (2S,3R)-1-(4-((1R,1′R,3r,3′R,5S,5′S)-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)-3-oxo-3,4-     dihydroquinoxalin-2-yl)-3-aminoazetidine-2-carboxylic acid, -   (2S,3R)-1-(4-((1R,1′R,3r,3′R,5S,5′S)-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)-3-oxo-3,4-     dihydroquinoxalin-2-yl)-3-(dimethylamino)azetidine-2-carboxylic     acid, and -   (2S,3R)-1-(4-((1R,1′R,3r,3′R,5S,5′S)-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)-3-oxo-3,4-     dihydroquinoxalin-2-yl)-3-acetamidoazetidine-2-carboxylic acid.

In another embodiment, the Azetidine-Substituted Quinoxaline-Type Piperidine Compound is not

-   3-amino-1-(4-((1R,3R,5S)-9-((1R,6S,8s)-bicyclo[4.3.1]decan-8-yl)-9-azabicyclo[3.3.1]nonan-3-yl)-3-oxo-3,4-dihydroquinoxalin-2-yl)azetidine-3-carboxylic     acid, -   1-(4-((1R,3R,5S)-9-((1R,6S,8s)-bicyclo[4.3.1]decan-8-yl)-9-azabicyclo[3.3.1]nonan-3-yl)-3-oxo-3,4-     dihydroquinoxalin-2-yl)-3-(dimethylamino)azetidine-3-carboxylic     acid, -   (2S,3R)-1-(4-((1R,3R,5S)-9-((1R,6S,8s)-bicyclo[4.3.1]decan-8-yl)-9-azabicyclo[3.3.1]nonan-3-yl)-3-oxo-3,4-dihydroquinoxalin-2-yl)-3-(methylamino)azetidine-2-carboxylic     acid, -   (2S,3R)-1-(4-((1R,1′R,3r,3′R,5S,5′S)-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)-3-oxo-3,4-     dihydroquinoxalin-2-yl)-3-aminoazetidine-2-carboxylic acid, -   (2S,3R)-1-(4-((1R,1′R,3r,3′     R,5S,5′S)-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)-3-oxo-3,4-     dihydroquinoxalin-2-yl)-3-(dimethylamino)azetidine-2-carboxylic     acid, and -   (2S,3R)-1-(4-((1R,1′R,3r,3′R,5S,5′S)-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)-3-oxo-3,4-     dihydroquinoxalin-2-yl)-3-acetamidoazetidine-2-carboxylic acid.

In another embodiment, the pharmaceutically acceptable derivative of a compounds of Formula (I) is a pharmaceutically acceptable salt. In another embodiment, the pharmaceutically acceptable salt is a hydrochloride salt. In another embodiment, the pharmaceutically acceptable salt is a sodium salt. In another embodiment, the pharmaceutically acceptable salt is a potassium salt. In another embodiment, the pharmaceutically acceptable salt is a para-toluenesulfonic acid salt.

In other embodiments, the Azetidine-Substituted Quinoxaline-Type Piperidine Compound of Formula (I) has one of the formulae of Table 1.

TABLE 1 Formula Compound IA

IB

IC

ID

ID₁ ^(†)

ID₂ ^(‡)

IE

IE₁ ^(†)

IE₂ ^(‡)

IF

IF₁ ^(†)

IF₂ ^(‡)

IG

IG₁ ^(†)

IG₂ ^(‡)

IH

IH₁ ^(†)

IH₂ ^(‡)

IJ

IJ₁ ^(†)

IJ₂ ^(‡)

IK

IK₁ ^(†)

IK₂ ^(‡)

IL

IL₁ ^(†)

IL₂ ^(‡)

IM

IM₁ ^(†)

IM₂ ^(‡)

^(†)indicates the 6-membered, nitrogen-containing ring that is fused to the benzo or pyridino is in the endo-configuration with respect to the alkyl or —CH₂—O—CH₂— bridge. ^(‡)indicates the 6-membered, nitrogen-containing ring that is fused to the benzo or pyridino is in the exo-configuration with respect to the alkyl or —CH₂—O—CH₂— bridge. where R₁, R₂, R₃, Z, a, and b are as defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I).

Illustrative Compounds of Formula (I) are listed below in Tables 2-13.

TABLE 2

(a)

(b) and pharmaceutically acceptable derivatives thereof, where:

Compound R_(3a) * R_(3b) † R_(3c) ‡ R₈′ Aa1 a or b —H —H —H —H A1 a or b —C(O)OH —H —H —H A2 a or b —H —C(O)OH —H —H A3 a or b —CH₃ —H —H —H A4 a or b —H —CH₃ —H —H A5 a or b —CH₃ —CH₃ —H —H A6 a or b —C(O)OH —CH₃ —H —H A7 a or b —C(O)OH —H —CH₃ —H A8 a or b —CH₃ —C(O)OH —H —H A9 a or b —H —H —H —CH₃ A10 a or b —C(O)OH —H —H —CH₃ A11 a or b —H —C(O)OH —H —CH₃ A12 a or b —CH₃ —H —H —CH₃ A13 a or b —H —CH₃ —H —CH₃ A14 a or b —CH₃ —CH₃ —H —CH₃ A15 a or b —C(O)OH —CH₃ —H —CH₃ A16 a or b —C(O)OH —H —CH₃ —CH₃ A17 a or b —CH₃ —C(O)OH —H —CH₃ A18 a or b —H —H —H —CH₂CH₃ A19 a or b —C(O)OH —H —H —CH₂CH₃ A20 a or b —H —C(O)OH —H —CH₂CH₃ A21 a or b —CH₃ —H —H —CH₂CH₃ A22 a or b —H —CH₃ —H —CH₂CH₃ A23 a or b —CH₃ —CH₃ —H —CH₂CH₃ A24 a or b —C(O)OH —CH₃ —H —CH₂CH₃ A25 a or b —C(O)OH —H —CH₃ —CH₂CH₃ A26 a or b —CH₃ —C(O)OH —H —CH₂CH₃ A27 a or b —CH₂C(O)OH —H —H —H A28 a or b —H —CH₂C(O)OH —H —H A29 a or b —CH₂C(O)OH —CH₃ —H —H A30 a or b —CH₂C(O)OH —H —CH₃ —H A31 a or b —CH₃ —CH₂C(O)OH —H —H A32 a or b —CH₂C(O)OH —H —H —CH₃ A33 a or b —H —CH₂C(O)OH —H —CH₃ A34 a or b —CH₂C(O)OH —CH₃ —H —CH₃ A35 a or b —CH₂C(O)OH —H —CH₃ —CH₃ A36 a or b —CH₃ —CH₂C(O)OH —H —CH₃ A37 a or b —CH₂C(O)OH —H —H —CH₂CH₃ A38 a or b —H —CH₂C(O)OH —H —CH₂CH₃ A39 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ A40 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ A41 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ A42 a or b —H —NH₂ —H —H A43 a or b —H —N(H)CH₃ —H —H A44 a or b —H —N(CH₃)₂ —H —H A45 a or b —H —NHC(O)CH₃ —H —H A46 a or b —H —OCH₃ —H —H A47 a or b —H —NH₂ —H —CH₃ A48 a or b —H —N(H)CH₃ —H —CH₃ A49 a or b —H —N(CH₃)₂ —H —CH₃ A50 a or b —H —NHC(O)CH₃ —H —CH₃ A51 a or b —H —OCH₃ —H —CH₃ A52 a or b —H —NH₂ —H —CH₂CH₃ A53 a or b —H —N(H)CH₃ —H —CH₂CH₃ A54 a or b —H —N(CH₃)₂ —H —CH₂CH₃ A55 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ A56 a or b —H —OCH₃ —H —CH₂CH₃ A57 a or b —H —NH₂ —CH₃ —H A58 a or b —H —N(H)CH₃ —CH₃ —H A59 a or b —H —N(CH₃)₂ —CH₃ —H A60 a or b —H —NHC(O)CH₃ —CH₃ —H A61 a or b —H —OCH₃ —CH₃ —H A62 a or b —H —NH₂ —CH₃ —CH₃ A63 a or b —H —N(H)CH₃ —CH₃ —CH₃ A64 a or b —H —N(CH₃)₂ —CH₃ —CH₃ A65 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ A66 a or b —H —OCH₃ —CH₃ —CH₃ A67 a or b —H —NH₂ —CH₃ —CH₂CH₃ A68 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ A69 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ A70 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ A71 a or b —H —OCH₃ —CH₃ —CH₂CH₃ A72 a or b —CH₃ —NH₂ —H —H A73 a or b —CH₃ —N(H)CH₃ —H —H A74 a or b —CH₃ —N(CH₃)₂ —H —H A75 a or b —CH₃ —NHC(O)CH₃ —H —H A76 a or b —CH₃ —OCH₃ —H —H A77 a or b —CH₃ —NH₂ —H —CH₃ A78 a or b —CH₃ —N(H)CH₃ —H —CH₃ A79 a or b —CH₃ —N(CH₃)₂ —H —CH₃ A80 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ A81 a or b —CH₃ —OCH₃ —H —CH₃ A82 a or b —CH₃ —NH₂ —H —CH₂CH₃ A83 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ A84 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ A85 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ A86 a or b —CH₃ —OCH₃ —H —CH₂CH₃ A87 a or b —CH₃ —NH₂ —CH₃ —H A88 a or b —CH₃ —N(H)CH₃ —CH₃ —H A89 a or b —CH₃ —N(CH₃)₂ —CH₃ —H A90 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H A91 a or b —CH₃ —OCH₃ —CH₃ —H A92 a or b —CH₃ —NH₂ —CH₃ —CH₃ A93 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ A94 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ A95 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ A96 a or b —CH₃ —OCH₃ —CH₃ —CH₃ A97 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ A98 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ A99 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ A100 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ A101 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ A102 a or b —C(O)OH —NH₂ —H —H A103 a or b —C(O)OH —N(H)CH₃ —H —H A104 a or b —C(O)OH —N(CH₃)₂ —H —H A105 a or b —C(O)OH —NHC(O)CH₃ —H —H A106 a or b —C(O)OH —OCH₃ —H —H A107 a or b —C(O)OH —NH₂ —H —CH₃ A108 a or b —C(O)OH —N(H)CH₃ —H —CH₃ A109 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ A110 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ A111 a or b —C(O)OH —OCH₃ —H —CH₃ A112 a or b —C(O)OH —NH₂ —H —CH₂CH₃ A113 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ A114 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ A115 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ A116 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ A117 a or b —C(O)OH —NH₂ —CH₃ —H A118 a or b —C(O)OH —N(H)CH₃ —CH₃ —H A119 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H A120 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H A121 a or b —C(O)OH —OCH₃ —CH₃ —H A122 a or b —C(O)OH —NH₂ —CH₃ —CH₃ A123 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ A124 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ A125 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ A126 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ A127 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ A128 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ A129 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ A130 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ A131 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ A132 a or b —CH₂C(O)OH —NH₂ —H —H A133 a or b —CH₂C(O)OH —N(H)CH₃ —H —H A134 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H A135 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H A136 a or b —CH₂C(O)OH —OCH₃ —H —H A137 a or b —CH₂C(O)OH —NH₂ —H —CH₃ A138 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ A139 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ A140 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ A141 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ A142 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ A143 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ A144 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ A145 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ A146 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ A147 a or b —CH₂C(O)OH —NH₂ —CH₃ —H A148 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H A149 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H A150 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H A151 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H A152 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ A153 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ A154 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ A155 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ A156 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ A157 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ A158 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ A159 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ A160 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ A161 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ * (i) Indicates that the carbon atom to which R_(3a) is attached is in the (R)- configuration, (ii) indicates that the carbon atom to which R_(3a) is attached is in the S- configuration, and (iii) indicates that the carbon atom to which R_(3a) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)- configurations. † (iv) Indicates that the carbon atom to which R_(3b) is attached is in the (R)- configuration, (v) indicates that the carbon atom to which R_(3b) is attached is in the (S)- configuration, and (vi) indicates that the carbon atom to which R_(3b) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)- configurations. ‡ (vii) Indicates that the carbon atom to which R_(3c) is attached is in the (R)- configuration, (viii) indicates that the carbon atom to which R_(3c) is attached is in the (S)- configuration, and (ix) indicates that the carbon atom to which R_(3c) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)- configurations.

TABLE 3

(a)

(b) and pharmaceutically acceptable derivatives thereof, where:

Compound R_(3a) * R_(3b) †  R_(3c) ‡ R₈′ B1 a or b —H —H —H —H B2 a or b —C(O)OH —H —H —H B3 a or b —H —C(O)OH —H —H B4 a or b —CH₃ —H —H —H B5 a or b —H —CH₃ —H —H B6 a or b —CH₃ —CH₃ —H —H B7 a or b —C(O)OH —CH₃ —H —H B8 a or b —C(O)OH —H —CH₃ —H B9 a or b —CH₃ —C(O)OH —H —H B10 a or b —H —H —H —CH₃ B11 a or b —C(O)OH —H —H —CH₃ B12 a or b —H —C(O)OH —H —CH₃ B13 a or b —CH₃ —H —H —CH₃ B14 a or b —H —CH₃ —H —CH₃ B15 a or b —CH₃ —CH₃ —H —CH₃ B16 a or b —C(O)OH —CH₃ —H —CH₃ B17 a or b —C(O)OH —H —CH₃ —CH₃ B18 a or b —CH₃ —C(O)OH —H —CH₃ B19 a or b —H —H —H —CH₂CH₃ B20 a or b —C(O)OH —H —H —CH₂CH₃ B21 a or b —H —C(O)OH —H —CH₂CH₃ B22 a or b —CH₃ —H —H —CH₂CH₃ B23 a or b —H —CH₃ —H —CH₂CH₃ B24 a or b —CH₃ —CH₃ —H —CH₂CH₃ B25 a or b —C(O)OH —CH₃ —H —CH₂CH₃ B26 a or b —C(O)OH —H —CH₃ —CH₂CH₃ B27 a or b —CH₃ —C(O)OH —H —CH₂CH₃ B28 a or b —CH₂C(O)OH —H —H —H B29 a or b —H —CH₂C(O)OH —H —H B30 a or b —CH₂C(O)OH —CH₃ —H —H B31 a or b —CH₂C(O)OH —H —CH₃ —H B32 a or b —CH₃ —CH₂C(O)OH —H —H B33 a or b —CH₂C(O)OH —H —H —CH₃ B34 a or b —H —CH₂C(O)OH —H —CH₃ B35 a or b —CH₂C(O)OH —CH₃ —H —CH₃ B36 a or b —CH₂C(O)OH —H —CH₃ —CH₃ B37 a or b —CH₃ —CH₂C(O)OH —H —CH₃ B38 a or b —CH₂C(O)OH —H —H —CH₂CH₃ B39 a or b —H —CH₂C(O)OH —H —CH₂CH₃ B40 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ B41 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ B42 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ B43 a or b —H —NH₂ —H —H B44 a or b —H —N(H)CH₃ —H —H B45 a or b —H —N(CH₃)₂ —H —H B46 a or b —H —NHC(O)CH₃ —H —H B47 a or b —H —OCH₃ —H —H B48 a or b —H —NH₂ —H —CH₃ B49 a or b —H —N(H)CH₃ —H —CH₃ B50 a or b —H —N(CH₃)₂ —H —CH₃ B51 a or b —H —NHC(O)CH₃ —H —CH₃ B52 a or b —H —OCH₃ —H —CH₃ B53 a or b —H —NH₂ —H —CH₂CH₃ B54 a or b —H —N(H)CH₃ —H —CH₂CH₃ B55 a or b —H —N(CH₃)₂ —H —CH₂CH₃ B56 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ B57 a or b —H —OCH₃ —H —CH₂CH₃ B58 a or b —H —NH₂ —CH₃ —H B59 a or b —H —N(H)CH₃ —CH₃ —H B60 a or b —H —N(CH₃)₂ —CH₃ —H B61 a or b —H —NHC(O)CH₃ —CH₃ —H B62 a or b —H —OCH₃ —CH₃ —H B63 a or b —H —NH₂ —CH₃ —CH₃ B64 a or b —H —N(H)CH₃ —CH₃ —CH₃ B65 a or b —H —N(CH₃)₂ —CH₃ —CH₃ B66 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ B67 a or b —H —OCH₃ —CH₃ —CH₃ B68 a or b —H —NH₂ —CH₃ —CH₂CH₃ B69 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ B70 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ B71 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ B72 a or b —H —OCH₃ —CH₃ —CH₂CH₃ B73 a or b —CH₃ —NH₂ —H —H B74 a or b —CH₃ —N(H)CH₃ —H —H B75 a or b —CH₃ —N(CH₃)₂ —H —H B76 a or b —CH₃ —NHC(O)CH₃ —H —H B77 a or b —CH₃ —OCH₃ —H —H B78 a or b —CH₃ —NH₂ —H —CH₃ B79 a or b —CH₃ —N(H)CH₃ —H —CH₃ B80 a or b —CH₃ —N(CH₃)₂ —H —CH₃ B81 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ B82 a or b —CH₃ —OCH₃ —H —CH₃ B83 a or b —CH₃ —NH₂ —H —CH₂CH₃ B84 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ B85 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ B86 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ B87 a or b —CH₃ —OCH₃ —H —CH₂CH₃ B88 a or b —CH₃ —NH₂ —CH₃ —H B89 a or b —CH₃ —N(H)CH₃ —CH₃ —H B90 a or b —CH₃ —N(CH₃)₂ —CH₃ —H B91 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H B92 a or b —CH₃ —OCH₃ —CH₃ —H B93 a or b —CH₃ —NH₂ —CH₃ —CH₃ B94 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ B95 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ B96 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ B97 a or b —CH₃ —OCH₃ —CH₃ —CH₃ B98 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ B99 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ B100 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ B101 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ B102 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ B103 a or b —C(O)OH —NH₂ —H —H B104 a or b —C(O)OH —N(H)CH₃ —H —H B105 a or b —C(O)OH —N(CH₃)₂ —H —H B106 a or b —C(O)OH —NHC(O)CH₃ —H —H B107 a or b —C(O)OH —OCH₃ —H —H B108 a or b —C(O)OH —NH₂ —H —CH₃ B109 a or b —C(O)OH —N(H)CH₃ —H —CH₃ B110 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ B111 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ B112 a or b —C(O)OH —OCH₃ —H —CH₃ B113 a or b —C(O)OH —NH₂ —H —CH₂CH₃ B114 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ B115 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ B116 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ B117 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ B118 a or b —C(O)OH —NH₂ —CH₃ —H B119 a or b —C(O)OH —N(H)CH₃ —CH₃ —H B120 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H B121 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H B122 a or b —C(O)OH —OCH₃ —CH₃ —H B123 a or b —C(O)OH —NH₂ —CH₃ —CH₃ B124 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ B125 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ B126 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ B127 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ B128 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ B129 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ B130 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ B131 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ B132 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ B133 a or b —CH₂C(O)OH —NH₂ —H —H B134 a or b —CH₂C(O)OH —N(H)CH₃ —H —H B135 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H B136 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H B137 a or b —CH₂C(O)OH —OCH₃ —H —H B138 a or b —CH₂C(O)OH —NH₂ —H —CH₃ B139 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ B140 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ B141 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ B142 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ B143 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ B144 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ B145 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ B146 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ B147 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ B148 a or b —CH₂C(O)OH —NH₂ —CH₃ —H B149 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H B150 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H B151 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H B152 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H B153 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ B154 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ B155 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ B156 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ B157 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ B158 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ B159 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ B160 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ B161 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ B162 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ * (i) Indicates that the carbon atom to which R_(3a) is attached is in the (R)-configuration, (ii) indicates that the carbon atom to which R_(3a) is attached is in the S-configuration, and (iii) indicates that the carbon atom to which R_(3a) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. † (iv) Indicates that the carbon atom to which R_(3b) is attached is in the (R)-configuration, (v) indicates that the carbon atom to which R_(3b) is attached is in the (S)-configuration, and (vi) indicates that the carbon atom to which R_(3b) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. ‡ (vii) Indicates that the carbon atom to which R_(3c) is attached is in the (R)-configuration, (viii) indicates that the carbon atom to which R_(3c) is attached is in the (S)-configuration, and (ix) indicates that the carbon atom to which R_(3c) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations.

TABLE 4

(a)

(b) and pharmaceutically acceptable derivatives thereof, where:

Compound R_(3a) * R_(3b) † R_(3c) ‡ R₈′ C1 a or b —H —H —H —H C2 a or b —C(O)OH —H —H —H C3 a or b —H —C(O)OH —H —H C4 a or b —CH₃ —H —H —H C5 a or b —H —CH₃ —H —H C6 a or b —CH₃ —CH₃ —H —H C7 a or b —C(O)OH —CH₃ —H —H C8 a or b —C(O)OH —H —CH₃ —H C9 a or b —CH₃ —C(O)OH —H —H C10 a or b —H —H —H —CH₃ C11 a or b —C(O)OH —H —H —CH₃ C12 a or b —H —C(O)OH —H —CH₃ C60 a or b —H —N(CH₃)₂ —CH₃ —H C61 a or b —H —NHC(O)CH₃ —CH₃ —H C62 a or b —H —OCH₃ —CH₃ —H C63 a or b —H —NH₂ —CH₃ —CH₃ C64 a or b —H —N(H)CH₃ —CH₃ —CH₃ C65 a or b —H —N(CH₃)₂ —CH₃ —CH₃ C66 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ C67 a or b —H —OCH₃ —CH₃ —CH₃ C68 a or b —H —NH₂ —CH₃ —CH₂CH₃ C69 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ C70 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ C71 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ C72 a or b —H —OCH₃ —CH₃ —CH₂CH₃ C73 a or b —CH₃ —NH₂ —H —H C74 a or b —CH₃ —N(H)CH₃ —H —H C75 a or b —CH₃ —N(CH₃)₂ —H —H C76 a or b —CH₃ —NHC(O)CH₃ —H —H C77 a or b —CH₃ —OCH₃ —H —H C78 a or b —CH₃ —NH₂ —H —CH₃ C79 a or b —CH₃ —N(H)CH₃ —H —CH₃ C80 a or b —CH₃ —N(CH₃)₂ —H —CH₃ C81 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ C82 a or b —CH₃ —OCH₃ —H —CH₃ C83 a or b —CH₃ —NH₂ —H —CH₂CH₃ C84 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ C85 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ C86 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ C87 a or b —CH₃ —OCH₃ —H —CH₂CH₃ C88 a or b —CH₃ —NH₂ —CH₃ —H C89 a or b —CH₃ —N(H)CH₃ —CH₃ —H C90 a or b —CH₃ —N(CH₃)₂ —CH₃ —H C91 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H C92 a or b —CH₃ —OCH₃ —CH₃ —H C93 a or b —CH₃ —NH₂ —CH₃ —CH₃ C94 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ C95 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ C96 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ C97 a or b —CH₃ —OCH₃ —CH₃ —CH₃ C98 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ C99 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ C100 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ C101 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ C102 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ C103 a or b —C(O)OH —NH₂ —H —H C104 a or b —C(O)OH —N(H)CH₃ —H —H C105 a or b —C(O)OH —N(CH₃)₂ —H —H C106 a or b —C(O)OH —NHC(O)CH₃ —H —H C107 a or b —C(O)OH —OCH₃ —H —H C108 a or b —C(O)OH —NH₂ —H —CH₃ C109 a or b —C(O)OH —N(H)CH₃ —H —CH₃ C110 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ C111 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ C112 a or b —C(O)OH —OCH₃ —H —CH₃ C113 a or b —C(O)OH —NH₂ —H —CH₂CH₃ C114 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ C115 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ C116 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ C117 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ C118 a or b —C(O)OH —NH₂ —CH₃ —H C119 a or b —C(O)OH —N(H)CH₃ —CH₃ —H C120 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H C121 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H C122 a or b —C(O)OH —OCH₃ —CH₃ —H C123 a or b —C(O)OH —NH₂ —CH₃ —CH₃ C124 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ C125 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ C126 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ C127 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ C128 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ C129 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ C130 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ C131 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ C132 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ C133 a or b —CH₂C(O)OH —NH₂ —H —H C134 a or b —CH₂C(O)OH —N(H)CH₃ —H —H C135 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H C136 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H C137 a or b —CH₂C(O)OH —OCH₃ —H —H C138 a or b —CH₂C(O)OH —NH₂ —H —CH₃ C139 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ C140 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ C141 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ C142 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ C143 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ C144 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ C145 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ C146 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ C147 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ C148 a or b —CH₂C(O)OH —NH₂ —CH₃ —H C149 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H C150 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H C151 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H C152 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H C153 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ C154 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ C155 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ C156 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ C157 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ C158 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ C159 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ C160 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ C161 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ C162 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ * (i) Indicates that the carbon atom to which R_(3a) is attached is in the (R)-configuration, (ii) indicates that the carbon atom to which R_(3a) is attached is in the S-configuration, and (iii) indicates that the carbon atom to which R_(3a) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. † (iv) Indicates that the carbon atom to which R_(3b) is attached is in the (R)-configuration, (v) indicates that the carbon atom to which R_(3b) is attached is in the (S)-configuration, and (vi) indicates that the carbon atom to which R_(3b) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. ‡ (vii) Indicates that the carbon atom to which R_(3c) is attached is in the (R)-configuration, (viii) indicates that the carbon atom to which R_(3c) is attached is in the (S)-configuration, and (ix) indicates that the carbon atom to which R_(3c) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations.

TABLE 5

(a)

(b) and pharmaceutically acceptable derivatives thereof, where:

Compound R_(3a) * R_(3b) †  R_(3c) ‡ R₈′ d D1 a or b —H —H —H —H 0 D2 a or b —C(O)OH —H —H —H 0 D3 a or b —H —C(O)OH —H —H 0 D4 a or b —CH₃ —H —H —H 0 D5 a or b —H —CH₃ —H —H 0 D6 a or b —CH₃ —CH₃ —H —H 0 D7 a or b —C(O)OH —CH₃ —H —H 0 D8 a or b —C(O)OH —H —CH₃ —H 0 D9 a or b —CH₃ —C(O)OH —H —H 0 D10 a or b —H —H —H —CH₃ 0 D11 a or b —C(O)OH —H —H —CH₃ 0 D12 a or b —H —C(O)OH —H —CH₃ 0 D13 a or b —CH₃ —H —H —CH₃ 0 D14 a or b —H —CH₃ —H —CH₃ 0 D15 a or b —CH₃ —CH₃ —H —CH₃ 0 D16 a or b —C(O)OH —CH₃ —H —CH₃ 0 D17 a or b —C(O)OH —H —CH₃ —CH₃ 0 D18 a or b —CH₃ —C(O)OH —H —CH₃ 0 D19 a or b —H —H —H —CH₂CH₃ 0 D20 a or b —C(O)OH —H —H —CH₂CH₃ 0 D21 a or b —H —C(O)OH —H —CH₂CH₃ 0 D22 a or b —CH₃ —H —H —CH₂CH₃ 0 D23 a or b —H —CH₃ —H —CH₂CH₃ 0 D24 a or b —CH₃ —CH₃ —H —CH₂CH₃ 0 D25 a or b —C(O)OH —CH₃ —H —CH₂CH₃ 0 D26 a or b —C(O)OH —H —CH₃ —CH₂CH₃ 0 D27 a or b —CH₃ —C(O)OH —H —CH₂CH₃ 0 D28 a or b —CH₂C(O)OH —H —H —H 0 D29 a or b —H —CH₂C(O)OH —H —H 0 D30 a or b —CH₂C(O)OH —CH₃ —H —H 0 D31 a or b —CH₂C(O)OH —H —CH₃ —H 0 D32 a or b —CH₃ —CH₂C(O)OH —H —H 0 D33 a or b —CH₂C(O)OH —H —H —CH₃ 0 D34 a or b —H —CH₂C(O)OH —H —CH₃ 0 D35 a or b —CH₂C(O)OH —CH₃ —H —CH₃ 0 D36 a or b —CH₂C(O)OH —H —CH₃ —CH₃ 0 D37 a or b —CH₃ —CH₂C(O)OH —H —CH₃ 0 D38 a or b —CH₂C(O)OH —H —H —CH₂CH₃ 0 D39 a or b —H —CH₂C(O)OH —H —CH₂CH₃ 0 D40 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ 0 D41 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ 0 D42 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ 0 D43 a or b —H —H —H —H 1 D44 a or b —C(O)OH —H —H —H 1 D45 a or b —H —C(O)OH —H —H 1 D46 a or b —CH₃ —H —H —H 1 D47 a or b —H —CH₃ —H —H 1 D48 a or b —CH₃ —CH₃ —H —H 1 D49 a or b —C(O)OH —CH₃ —H —H 1 D50 a or b —C(O)OH —H —CH₃ —H 1 D51 a or b —CH₃ —C(O)OH —H —H 1 D52 a or b —H —H —H —CH₃ 1 D53 a or b —C(O)OH —H —H —CH₃ 1 D54 a or b —H —C(O)OH —H —CH₃ 1 D55 a or b —CH₃ —H —H —CH₃ 1 D56 a or b —H —CH₃ —H —CH₃ 1 D57 a or b —CH₃ —CH₃ —H —CH₃ 1 D58 a or b —C(O)OH —CH₃ —H —CH₃ 1 D59 a or b —C(O)OH —H —CH₃ —CH₃ 1 D60 a or b —CH₃ —C(O)OH —H —CH₃ 1 D61 a or b —H —H —H —CH₂CH₃ 1 D62 a or b —C(O)OH —H —H —CH₂CH₃ 1 D63 a or b —H —C(O)OH —H —CH₂CH₃ 1 D64 a or b —CH₃ —H —H —CH₂CH₃ 1 D65 a or b —H —CH₃ —H —CH₂CH₃ 1 D66 a or b —CH₃ —CH₃ —H —CH₂CH₃ 1 D67 a or b —C(O)OH —CH₃ —H —CH₂CH₃ 1 D68 a or b —C(O)OH —H —CH₃ —CH₂CH₃ 1 D69 a or b —CH₃ —C(O)OH —H —CH₂CH₃ 1 D70 a or b —CH₂C(O)OH —H —H —H 1 D71 a or b —H —CH₂C(O)OH —H —H 1 D72 a or b —CH₂C(O)OH —CH₃ —H —H 1 D73 a or b —CH₂C(O)OH —H —CH₃ —H 1 D74 a or b —CH₃ —CH₂C(O)OH —H —H 1 D75 a or b —CH₂C(O)OH —H —H —CH₃ 1 D76 a or b —H —CH₂C(O)OH —H —CH₃ 1 D77 a or b —CH₂C(O)OH —CH₃ —H —CH₃ 1 D78 a or b —CH₂C(O)OH —H —CH₃ —CH₃ 1 D79 a or b —CH₃ —CH₂C(O)OH —H —CH₃ 1 D80 a or b —CH₂C(O)OH —H —H —CH₂CH₃ 1 D81 a or b —H —CH₂C(O)OH —H —CH₂CH₃ 1 D82 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ 1 D83 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ 1 D84 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ 1 D85 a or b —H —H —H —H 2 D86 a or b —C(O)OH —H —H —H 2 D87 a or b —H —C(O)OH —H —H 2 D88 a or b —CH₃ —H —H —H 2 D89 a or b —H —CH₃ —H —H 2 D90 a or b —CH₃ —CH₃ —H —H 2 D91 a or b —C(O)OH —CH₃ —H —H 2 D92 a or b —C(O)OH —H —CH₃ —H 2 D93 a or b —CH₃ —C(O)OH —H —H 2 D94 a or b —H —H —H —CH₃ 2 D95 a or b —C(O)OH —H —H —CH₃ 2 D96 a or b —H —C(O)OH —H —CH₃ 2 D97 a or b —CH₃ —H —H —CH₃ 2 D98 a or b —H —CH₃ —H —CH₃ 2 D99 a or b —CH₃ —CH₃ —H —CH₃ 2 D100 a or b —C(O)OH —CH₃ —H —CH₃ 2 D101 a or b —C(O)OH —H —CH₃ —CH₃ 2 D102 a or b —CH₃ —C(O)OH —H —CH₃ 2 D103 a or b —H —H —H —CH₂CH₃ 2 D104 a or b —C(O)OH —H —H —CH₂CH₃ 2 D105 a or b —H —C(O)OH —H —CH₂CH₃ 2 D106 a or b —CH₃ —H —H —CH₂CH₃ 2 D107 a or b —H —CH₃ —H —CH₂CH₃ 2 D108 a or b —CH₃ —CH₃ —H —CH₂CH₃ 2 D109 a or b —C(O)OH —CH₃ —H —CH₂CH₃ 2 D110 a or b —C(O)OH —H —CH₃ —CH₂CH₃ 2 D111 a or b —CH₃ —C(O)OH —H —CH₂CH₃ 2 D112 a or b —CH₂C(O)OH —H —H —H 2 D113 a or b —H —CH₂C(O)OH —H —H 2 D114 a or b —CH₂C(O)OH —CH₃ —H —H 2 D115 a or b —CH₂C(O)OH —H —CH₃ —H 2 D116 a or b —CH₃ —CH₂C(O)OH —H —H 2 D117 a or b —CH₂C(O)OH —H —H —CH₃ 2 D118 a or b —H —CH₂C(O)OH —H —CH₃ 2 D119 a or b —CH₂C(O)OH —CH₃ —H —CH₃ 2 D120 a or b —CH₂C(O)OH —H —CH₃ —CH₃ 2 D121 a or b —CH₃ —CH₂C(O)OH —H —CH₃ 2 D122 a or b —CH₂C(O)OH —H —H —CH₂CH₃ 2 D123 a or b —H —CH₂C(O)OH —H —CH₂CH₃ 2 D124 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ 2 D125 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ 2 D126 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ 2 D127 a or b —H —NH₂ —H —H 0 D128 a or b —H —N(H)CH₃ —H —H 0 D129 a or b —H —N(CH₃)₂ —H —H 0 D130 a or b —H —NHC(O)CH₃ —H —H 0 D131 a or b —H —OCH₃ —H —H 0 D132 a or b —H —NH₂ —H —CH₃ 0 D133 a or b —H —N(H)CH₃ —H —CH₃ 0 D134 a or b —H —N(CH₃)₂ —H —CH₃ 0 D135 a or b —H —NHC(O)CH₃ —H —CH₃ 0 D136 a or b —H —OCH₃ —H —CH₃ 0 D137 a or b —H —NH₂ —H —CH₂CH₃ 0 D138 a or b —H —N(H)CH₃ —H —CH₂CH₃ 0 D139 a or b —H —N(CH₃)₂ —H —CH₂CH₃ 0 D140 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ 0 D141 a or b —H —OCH₃ —H —CH₂CH₃ 0 D142 a or b —H —NH₂ —CH₃ —H 0 D143 a or b —H —N(H)CH₃ —CH₃ —H 0 D144 a or b —H —N(CH₃)₂ —CH₃ —H 0 D145 a or b —H —NHC(O)CH₃ —CH₃ —H 0 D146 a or b —H —OCH₃ —CH₃ —H 0 D147 a or b —H —NH₂ —CH₃ —CH₃ 0 D148 a or b —H —N(H)CH₃ —CH₃ —CH₃ 0 D149 a or b —H —N(CH₃)₂ —CH₃ —CH₃ 0 D150 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ 0 D151 a or b —H —OCH₃ —CH₃ —CH₃ 0 D152 a or b —H —NH₂ —CH₃ —CH₂CH₃ 0 D153 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ 0 D154 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ 0 D155 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ 0 D156 a or b —H —OCH₃ —CH₃ —CH₂CH₃ 0 D157 a or b —CH₃ —NH₂ —H —H 0 D158 a or b —CH₃ —N(H)CH₃ —H —H 0 D159 a or b —CH₃ —N(CH₃)₂ —H —H 0 D160 a or b —CH₃ —NHC(O)CH₃ —H —H 0 D161 a or b —CH₃ —OCH₃ —H —H 0 D162 a or b —CH₃ —NH₂ —H —CH₃ 0 D163 a or b —CH₃ —N(H)CH₃ —H —CH₃ 0 D164 a or b —CH₃ —N(CH₃)₂ —H —CH₃ 0 D165 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ 0 D166 a or b —CH₃ —OCH₃ —H —CH₃ 0 D167 a or b —CH₃ —NH₂ —H —CH₂CH₃ 0 D168 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ 0 D169 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ 0 D170 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ 0 D171 a or b —CH₃ —OCH₃ —H —CH₂CH₃ 0 D172 a or b —CH₃ —NH₂ —CH₃ —H 0 D173 a or b —CH₃ —N(H)CH₃ —CH₃ —H 0 D174 a or b —CH₃ —N(CH₃)₂ —CH₃ —H 0 D175 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H 0 D176 a or b —CH₃ —OCH₃ —CH₃ —H 0 D177 a or b —CH₃ —NH₂ —CH₃ —CH₃ 0 D178 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ 0 D179 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ 0 D180 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ 0 D181 a or b —CH₃ —OCH₃ —CH₃ —CH₃ 0 D182 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ 0 D183 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ 0 D184 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ 0 D185 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ 0 D186 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ 0 D187 a or b —C(O)OH —NH₂ —H —H 0 D188 a or b —C(O)OH —N(H)CH₃ —H —H 0 D189 a or b —C(O)OH —N(CH₃)₂ —H —H 0 D190 a or b —C(O)OH —NHC(O)CH₃ —H —H 0 D191 a or b —C(O)OH —OCH₃ —H —H 0 D192 a or b —C(O)OH —NH₂ —H —CH₃ 0 D193 a or b —C(O)OH —N(H)CH₃ —H —CH₃ 0 D194 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ 0 D195 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ 0 D196 a or b —C(O)OH —OCH₃ —H —CH₃ 0 D197 a or b —C(O)OH —NH₂ —H —CH₂CH₃ 0 D198 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ 0 D199 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 0 D200 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 0 D201 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ 0 D202 a or b —C(O)OH —NH₂ —CH₃ —H 0 D203 a or b —C(O)OH —N(H)CH₃ —CH₃ —H 0 D204 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H 0 D205 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H 0 D206 a or b —C(O)OH —OCH₃ —CH₃ —H 0 D207 a or b —C(O)OH —NH₂ —CH₃ —CH₃ 0 D208 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ 0 D209 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 0 D210 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 0 D211 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ 0 D212 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ 0 D213 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 0 D214 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 0 D215 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 0 D216 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 0 D217 a or b —CH₂C(O)OH —NH₂ —H —H 0 D218 a or b —CH₂C(O)OH —N(H)CH₃ —H —H 0 D219 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H 0 D220 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H 0 D221 a or b —CH₂C(O)OH —OCH₃ —H —H 0 D222 a or b —CH₂C(O)OH —NH₂ —H —CH₃ 0 D223 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ 0 D224 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ 0 D225 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ 0 D226 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ 0 D227 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ 0 D228 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ 0 D229 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 0 D230 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 0 D231 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ 0 D232 a or b —CH₂C(O)OH —NH₂ —CH₃ —H 0 D233 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H 0 D234 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H 0 D235 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H 0 D236 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H 0 D237 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ 0 D238 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ 0 D239 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 0 D240 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 0 D241 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ 0 D242 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ 0 D243 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 0 D244 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 0 D245 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 0 D246 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 0 D247 a or b —H —NH₂ —H —H 1 D248 a or b —H —N(H)CH₃ —H —H 1 D249 a or b —H —N(CH₃)₂ —H —H 1 D250 a or b —H —NHC(O)CH₃ —H —H 1 D251 a or b —H —OCH₃ —H —H 1 D252 a or b —H —NH₂ —H —CH₃ 1 D253 a or b —H —N(H)CH₃ —H —CH₃ 1 D254 a or b —H —N(CH₃)₂ —H —CH₃ 1 D255 a or b —H —NHC(O)CH₃ —H —CH₃ 1 D256 a or b —H —OCH₃ —H —CH₃ 1 D257 a or b —H —NH₂ —H —CH₂CH₃ 1 D258 a or b —H —N(H)CH₃ —H —CH₂CH₃ 1 D259 a or b —H —N(CH₃)₂ —H —CH₂CH₃ 1 D260 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ 1 D261 a or b —H —OCH₃ —H —CH₂CH₃ 1 D262 a or b —H —NH₂ —CH₃ —H 1 D263 a or b —H —N(H)CH₃ —CH₃ —H 1 D264 a or b —H —N(CH₃)₂ —CH₃ —H 1 D265 a or b —H —NHC(O)CH₃ —CH₃ —H 1 D266 a or b —H —OCH₃ —CH₃ —H 1 D267 a or b —H —NH₂ —CH₃ —CH₃ 1 D268 a or b —H —N(H)CH₃ —CH₃ —CH₃ 1 D269 a or b —H —N(CH₃)₂ —CH₃ —CH₃ 1 D270 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ 1 D271 a or b —H —OCH₃ —CH₃ —CH₃ 1 D272 a or b —H —NH₂ —CH₃ —CH₂CH₃ 1 D273 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ 1 D274 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ 1 D275 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ 1 D276 a or b —H —OCH₃ —CH₃ —CH₂CH₃ 1 D277 a or b —CH₃ —NH₂ —H —H 1 D278 a or b —CH₃ —N(H)CH₃ —H —H 1 D279 a or b —CH₃ —N(CH₃)₂ —H —H 1 D280 a or b —CH₃ —NHC(O)CH₃ —H —H 1 D281 a or b —CH₃ —OCH₃ —H —H 1 D282 a or b —CH₃ —NH₂ —H —CH₃ 1 D283 a or b —CH₃ —N(H)CH₃ —H —CH₃ 1 D284 a or b —CH₃ —N(CH₃)₂ —H —CH₃ 1 D285 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ 1 D286 a or b —CH₃ —OCH₃ —H —CH₃ 1 D287 a or b —CH₃ —NH₂ —H —CH₂CH₃ 1 D288 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ 1 D289 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ 1 D290 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ 1 D291 a or b —CH₃ —OCH₃ —H —CH₂CH₃ 1 D292 a or b —CH₃ —NH₂ —CH₃ —H 1 D293 a or b —CH₃ —N(H)CH₃ —CH₃ —H 1 D294 a or b —CH₃ —N(CH₃)₂ —CH₃ —H 1 D295 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H 1 D296 a or b —CH₃ —OCH₃ —CH₃ —H 1 D297 a or b —CH₃ —NH₂ —CH₃ —CH₃ 1 D298 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ 1 D299 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ 1 D300 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ 1 D301 a or b —CH₃ —OCH₃ —CH₃ —CH₃ 1 D302 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ 1 D303 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ 1 D304 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ 1 D305 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ 1 D306 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ 1 D307 a or b —C(O)OH —NH₂ —H —H 1 D308 a or b —C(O)OH —N(H)CH₃ —H —H 1 D309 a or b —C(O)OH —N(CH₃)₂ —H —H 1 D310 a or b —C(O)OH —NHC(O)CH₃ —H —H 1 D311 a or b —C(O)OH —OCH₃ —H —H 1 D312 a or b —C(O)OH —NH₂ —H —CH₃ 1 D313 a or b —C(O)OH —N(H)CH₃ —H —CH₃ 1 D314 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ 1 D315 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ 1 D316 a or b —C(O)OH —OCH₃ —H —CH₃ 1 D317 a or b —C(O)OH —NH₂ —H —CH₂CH₃ 1 D318 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ 1 D319 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 1 D320 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 1 D321 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ 1 D322 a or b —C(O)OH —NH₂ —CH₃ —H 1 D323 a or b —C(O)OH —N(H)CH₃ —CH₃ —H 1 D324 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H 1 D325 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H 1 D326 a or b —C(O)OH —OCH₃ —CH₃ —H 1 D327 a or b —C(O)OH —NH₂ —CH₃ —CH₃ 1 D328 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ 1 D329 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 1 D330 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 1 D331 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ 1 D332 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ 1 D333 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 1 D334 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 1 D335 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 1 D336 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 1 D337 a or b —CH₂C(O)OH —NH₂ —H —H 1 D338 a or b —CH₂C(O)OH —N(H)CH₃ —H —H 1 D339 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H 1 D340 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H 1 D341 a or b —CH₂C(O)OH —OCH₃ —H —H 1 D342 a or b —CH₂C(O)OH —NH₂ —H —CH₃ 1 D343 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ 1 D344 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ 1 D345 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ 1 D346 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ 1 D347 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ 1 D348 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ 1 D349 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 1 D350 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 1 D351 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ 1 D352 a or b —CH₂C(O)OH —NH₂ —CH₃ —H 1 D353 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H 1 D354 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H 1 D355 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H 1 D356 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H 1 D357 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ 1 D358 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ 1 D359 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 1 D360 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 1 D361 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ 1 D362 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ 1 D363 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 1 D364 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 1 D365 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 1 D366 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 1 D367 a or b —H —NH₂ —H —H 2 D368 a or b —H —N(H)CH₃ —H —H 2 D369 a or b —H —N(CH₃)₂ —H —H 2 D370 a or b —H —NHC(O)CH₃ —H —H 2 D371 a or b —H —OCH₃ —H —H 2 D372 a or b —H —NH₂ —H —CH₃ 2 D373 a or b —H —N(H)CH₃ —H —CH₃ 2 D374 a or b —H —N(CH₃)₂ —H —CH₃ 2 D375 a or b —H —NHC(O)CH₃ —H —CH₃ 2 D376 a or b —H —OCH₃ —H —CH₃ 2 D377 a or b —H —NH₂ —H —CH₂CH₃ 2 D378 a or b —H —N(H)CH₃ —H —CH₂CH₃ 2 D379 a or b —H —N(CH₃)₂ —H —CH₂CH₃ 2 D380 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ 2 D381 a or b —H —OCH₃ —H —CH₂CH₃ 2 D382 a or b —H —NH₂ —CH₃ —H 2 D383 a or b —H —N(H)CH₃ —CH₃ —H 2 D384 a or b —H —N(CH₃)₂ —CH₃ —H 2 D385 a or b —H —NHC(O)CH₃ —CH₃ —H 2 D386 a or b —H —OCH₃ —CH₃ —H 2 D387 a or b —H —NH₂ —CH₃ —CH₃ 2 D388 a or b —H —N(H)CH₃ —CH₃ —CH₃ 2 D389 a or b —H —N(CH₃)₂ —CH₃ —CH₃ 2 D390 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ 2 D391 a or b —H —OCH₃ —CH₃ —CH₃ 2 D392 a or b —H —NH₂ —CH₃ —CH₂CH₃ 2 D393 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ 2 D394 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ 2 D395 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ 2 D396 a or b —H —OCH₃ —CH₃ —CH₂CH₃ 2 D397 a or b —CH₃ —NH₂ —H —H 2 D398 a or b —CH₃ —N(H)CH₃ —H —H 2 D399 a or b —CH₃ —N(CH₃)₂ —H —H 2 D400 a or b —CH₃ —NHC(O)CH₃ —H —H 2 D401 a or b —CH₃ —OCH₃ —H —H 2 D402 a or b —CH₃ —NH₂ —H —CH₃ 2 D403 a or b —CH₃ —N(H)CH₃ —H —CH₃ 2 D404 a or b —CH₃ —N(CH₃)₂ —H —CH₃ 2 D405 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ 2 D406 a or b —CH₃ —OCH₃ —H —CH₃ 2 D407 a or b —CH₃ —NH₂ —H —CH₂CH₃ 2 D408 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ 2 D409 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ 2 D410 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ 2 D411 a or b —CH₃ —OCH₃ —H —CH₂CH₃ 2 D412 a or b —CH₃ —NH₂ —CH₃ —H 2 D413 a or b —CH₃ —N(H)CH₃ —CH₃ —H 2 D414 a or b —CH₃ —N(CH₃)₂ —CH₃ —H 2 D415 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H 2 D416 a or b —CH₃ —OCH₃ —CH₃ —H 2 D417 a or b —CH₃ —NH₂ —CH₃ —CH₃ 2 D418 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ 2 D419 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ 2 D420 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ 2 D421 a or b —CH₃ —OCH₃ —CH₃ —CH₃ 2 D422 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ 2 D423 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ 2 D424 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ 2 D425 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ 2 D426 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ 2 D427 a or b —C(O)OH —NH₂ —H —H 2 D428 a or b —C(O)OH —N(H)CH₃ —H —H 2 D429 a or b —C(O)OH —N(CH₃)₂ —H —H 2 D430 a or b —C(O)OH —NHC(O)CH₃ —H —H 2 D431 a or b —C(O)OH —OCH₃ —H —H 2 D432 a or b —C(O)OH —NH₂ —H —CH₃ 2 D433 a or b —C(O)OH —N(H)CH₃ —H —CH₃ 2 D434 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ 2 D435 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ 2 D436 a or b —C(O)OH —OCH₃ —H —CH₃ 2 D437 a or b —C(O)OH —NH₂ —H —CH₂CH₃ 2 D438 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ 2 D439 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 2 D440 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 2 D441 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ 2 D442 a or b —C(O)OH —NH₂ —CH₃ —H 2 D443 a or b —C(O)OH —N(H)CH₃ —CH₃ —H 2 D444 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H 2 D445 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H 2 D446 a or b —C(O)OH —OCH₃ —CH₃ —H 2 D447 a or b —C(O)OH —NH₂ —CH₃ —CH₃ 2 D448 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ 2 D449 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 2 D450 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 2 D451 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ 2 D452 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ 2 D453 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 2 D454 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 2 D455 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 2 D456 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 2 D457 a or b —CH₂C(O)OH —NH₂ —H —H 2 D458 a or b —CH₂C(O)OH —N(H)CH₃ —H —H 2 D459 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H 2 D460 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H 2 D461 a or b —CH₂C(O)OH —OCH₃ —H —H 2 D462 a or b —CH₂C(O)OH —NH₂ —H —CH₃ 2 D463 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ 2 D464 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ 2 D465 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ 2 D466 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ 2 D467 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ 2 D468 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ 2 D469 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 2 D470 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 2 D471 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ 2 D472 a or b —CH₂C(O)OH —NH₂ —CH₃ —H 2 D473 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H 2 D474 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H 2 D475 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H 2 D476 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H 2 D477 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ 2 D478 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ 2 D479 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 2 D480 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 2 D481 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ 2 D482 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ 2 D483 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 2 D484 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 2 D485 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 2 D486 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 2 * (i) Indicates that the carbon atom to which R_(3a) is attached is in the (R)-configuration, (ii) indicates that the carbon atom to which R_(3a) is attached is in the S-configuration, and (iii) indicates that the carbon atom to which R_(3a) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. † (iv) Indicates that the carbon atom to which R_(3b) is attached is in the (R)-configuration, (v) indicates that the carbon atom to which R_(3b) is attached is in the (S)-configuration, and (vi) indicates that the carbon atom to which R_(3b) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. ‡ (vii) Indicates that the carbon atom to which R_(3c) is attached is in the (R)-configuration, (viii) indicates that the carbon atom to which R_(3c) is attached is in the (S)-configuration, and (ix) indicates that the carbon atom to which R_(3c) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations.

TABLE 6

(a)

(b) and pharmaceutically acceptable derivatives thereof, where:

Compound R_(3a) * R_(3b) † R_(3c) ‡ R₈′ d E1 a or b —H —H —H —H 0 E2 a or b —C(O)OH —H —H —H 0 E3 a or b —H —C(O)OH —H —H 0 E4 a or b —CH₃ —H —H —H 0 E5 a or b —H —CH₃ —H —H 0 E6 a or b —CH₃ —CH₃ —H —H 0 E7 a or b —C(O)OH —CH₃ —H —H 0 E8 a or b —C(O)OH —H —CH₃ —H 0 E9 a or b —CH₃ —C(O)OH —H —H 0 E10 a or b —H —H —H —CH₃ 0 E11 a or b —C(O)OH —H —H —CH₃ 0 E12 a or b —H —C(O)OH —H —CH₃ 0 E13 a or b —CH₃ —H —H —CH₃ 0 E14 a or b —H —CH₃ —H —CH₃ 0 E15 a or b —CH₃ —CH₃ —H —CH₃ 0 E16 a or b —C(O)OH —CH₃ —H —CH₃ 0 E17 a or b —C(O)OH —H —CH₃ —CH₃ 0 E18 a or b —CH₃ —C(O)OH —H —CH₃ 0 E19 a or b —H —H —H —CH₂CH₃ 0 E20 a or b —C(O)OH —H —H —CH₂CH₃ 0 E21 a or b —H —C(O)OH —H —CH₂CH₃ 0 E22 a or b —CH₃ —H —H —CH₂CH₃ 0 E23 a or b —H —CH₃ —H —CH₂CH₃ 0 E24 a or b —CH₃ —CH₃ —H —CH₂CH₃ 0 E25 a or b —C(O)OH —CH₃ —H —CH₂CH₃ 0 E26 a or b —C(O)OH —H —CH₃ —CH₂CH₃ 0 E27 a or b —CH₃ —C(O)OH —H —CH₂CH₃ 0 E28 a or b —CH₂C(O)OH —H —H —H 0 E29 a or b —H —CH₂C(O)OH —H —H 0 E30 a or b —CH₂C(O)OH —CH₃ —H —H 0 E31 a or b —CH₂C(O)OH —H —CH₃ —H 0 E32 a or b —CH₃ —CH₂C(O)OH —H —H 0 E33 a or b —CH₂C(O)OH —H —H —CH₃ 0 E34 a or b —H —CH₂C(O)OH —H —CH₃ 0 E35 a or b —CH₂C(O)OH —CH₃ —H —CH₃ 0 E36 a or b —CH₂C(O)OH —H —CH₃ —CH₃ 0 E37 a or b —CH₃ —CH₂C(O)OH —H —CH₃ 0 E38 a or b —CH₂C(O)OH —H —H —CH₂CH₃ 0 E39 a or b —H —CH₂C(O)OH —H —CH₂CH₃ 0 E40 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ 0 E41 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ 0 E42 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ 0 E43 a or b —H —H —H —H 1 E44 a or b —C(O)OH —H —H —H 1 E45 a or b —H —C(O)OH —H —H 1 E46 a or b —CH₃ —H —H —H 1 E47 a or b —H —CH₃ —H —H 1 E48 a or b —CH₃ —CH₃ —H —H 1 E49 a or b —C(O)OH —CH₃ —H —H 1 E50 a or b —C(O)OH —H —CH₃ —H 1 E51 a or b —CH₃ —C(O)OH —H —H 1 E52 a or b —H —H —H —CH₃ 1 E53 a or b —C(O)OH —H —H —CH₃ 1 E54 a or b —H —C(O)OH —H —CH₃ 1 E55 a or b —CH₃ —H —H —CH₃ 1 E56 a or b —H —CH₃ —H —CH₃ 1 E57 a or b —CH₃ —CH₃ —H —CH₃ 1 E58 a or b —C(O)OH —CH₃ —H —CH₃ 1 E59 a or b —C(O)OH —H —CH₃ —CH₃ 1 E60 a or b —CH₃ —C(O)OH —H —CH₃ 1 E61 a or b —H —H —H —CH₂CH₃ 1 E62 a or b —C(O)OH —H —H —CH₂CH₃ 1 E63 a or b —H —C(O)OH —H —CH₂CH₃ 1 E64 a or b —CH₃ —H —H —CH₂CH₃ 1 E65 a or b —H —CH₃ —H —CH₂CH₃ 1 E66 a or b —CH₃ —CH₃ —H —CH₂CH₃ 1 E67 a or b —C(O)OH —CH₃ —H —CH₂CH₃ 1 E68 a or b —C(O)OH —H —CH₃ —CH₂CH₃ 1 E69 a or b —CH₃ —C(O)OH —H —CH₂CH₃ 1 E70 a or b —CH₂C(O)OH —H —H —H 1 E71 a or b —H —CH₂C(O)OH —H —H 1 E72 a or b —CH₂C(O)OH —CH₃ —H —H 1 E73 a or b —CH₂C(O)OH —H —CH₃ —H 1 E74 a or b —CH₃ —CH₂C(O)OH —H —H 1 E75 a or b —CH₂C(O)OH —H —H —CH₃ 1 E76 a or b —H —CH₂C(O)OH —H —CH₃ 1 E77 a or b —CH₂C(O)OH —CH₃ —H —CH₃ 1 E78 a or b —CH₂C(O)OH —H —CH₃ —CH₃ 1 E79 a or b —CH₃ —CH₂C(O)OH —H —CH₃ 1 E80 a or b —CH₂C(O)OH —H —H —CH₂CH₃ 1 E81 a or b —H —CH₂C(O)OH —H —CH₂CH₃ 1 E82 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ 1 E83 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ 1 E84 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ 1 E85 a or b —H —H —H —H 2 E86 a or b —C(O)OH —H —H —H 2 E87 a or b —H —C(O)OH —H —H 2 E88 a or b —CH₃ —H —H —H 2 E89 a or b —H —CH₃ —H —H 2 E90 a or b —CH₃ —CH₃ —H —H 2 E91 a or b —C(O)OH —CH₃ —H —H 2 E92 a or b —C(O)OH —H —CH₃ —H 2 E93 a or b —CH₃ —C(O)OH —H —H 2 E94 a or b —H —H —H —CH₃ 2 E95 a or b —C(O)OH —H —H —CH₃ 2 E96 a or b —H —C(O)OH —H —CH₃ 2 E97 a or b —CH₃ —H —H —CH₃ 2 E98 a or b —H —CH₃ —H —CH₃ 2 E99 a or b —CH₃ —CH₃ —H —CH₃ 2 E100 a or b —C(O)OH —CH₃ —H —CH₃ 2 E101 a or b —C(O)OH —H —CH₃ —CH₃ 2 E102 a or b —CH₃ —C(O)OH —H —CH₃ 2 E103 a or b —H —H —H —CH₂CH₃ 2 E104 a or b —C(O)OH —H —H —CH₂CH₃ 2 E105 a or b —H —C(O)OH —H —CH₂CH₃ 2 E106 a or b —CH₃ —H —H —CH₂CH₃ 2 E107 a or b —H —CH₃ —H —CH₂CH₃ 2 E108 a or b —CH₃ —CH₃ —H —CH₂CH₃ 2 E109 a or b —C(O)OH —CH₃ —H —CH₂CH₃ 2 E110 a or b —C(O)OH —H —CH₃ —CH₂CH₃ 2 E111 a or b —CH₃ —C(O)OH —H —CH₂CH₃ 2 E112 a or b —CH₂C(O)OH —H —H —H 2 E113 a or b —H —CH₂C(O)OH —H —H 2 E114 a or b —CH₂C(O)OH —CH₃ —H —H 2 E115 a or b —CH₂C(O)OH —H —CH₃ —H 2 E116 a or b —CH₃ —CH₂C(O)OH —H —H 2 E117 a or b —CH₂C(O)OH —H —H —CH₃ 2 E118 a or b —H —CH₂C(O)OH —H —CH₃ 2 E119 a or b —CH₂C(O)OH —CH₃ —H —CH₃ 2 E120 a or b —CH₂C(O)OH —H —CH₃ —CH₃ 2 E121 a or b —CH₃ —CH₂C(O)OH —H —CH₃ 2 E122 a or b —CH₂C(O)OH —H —H —CH₂CH₃ 2 E123 a or b —H —CH₂C(O)OH —H —CH₂CH₃ 2 E124 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ 2 E125 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ 2 E126 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ 2 E127 a or b —H —NH₂ —H —H 0 E128 a or b —H —N(H)CH₃ —H —H 0 E129 a or b —H —N(CH₃)₂ —H —H 0 E130 a or b —H —NHC(O)CH₃ —H —H 0 E131 a or b —H —OCH₃ —H —H 0 E132 a or b —H —NH₂ —H —CH₃ 0 E133 a or b —H —N(H)CH₃ —H —CH₃ 0 E134 a or b —H —N(CH₃)₂ —H —CH₃ 0 E135 a or b —H —NHC(O)CH₃ —H —CH₃ 0 E136 a or b —H —OCH₃ —H —CH₃ 0 E137 a or b —H —NH₂ —H —CH₂CH₃ 0 E138 a or b —H —N(H)CH₃ —H —CH₂CH₃ 0 E139 a or b —H —N(CH₃)₂ —H —CH₂CH₃ 0 E140 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ 0 E141 a or b —H —OCH₃ —H —CH₂CH₃ 0 E142 a or b —H —NH₂ —CH₃ —H 0 E143 a or b —H —N(H)CH₃ —CH₃ —H 0 E144 a or b —H —N(CH₃)₂ —CH₃ —H 0 E145 a or b —H —NHC(O)CH₃ —CH₃ —H 0 E146 a or b —H —OCH₃ —CH₃ —H 0 E147 a or b —H —NH₂ —CH₃ —CH₃ 0 E148 a or b —H —N(H)CH₃ —CH₃ —CH₃ 0 E149 a or b —H —N(CH₃)₂ —CH₃ —CH₃ 0 E150 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ 0 E151 a or b —H —OCH₃ —CH₃ —CH₃ 0 E152 a or b —H —NH₂ —CH₃ —CH₂CH₃ 0 E153 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ 0 E154 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ 0 E155 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ 0 E156 a or b —H —OCH₃ —CH₃ —CH₂CH₃ 0 E157 a or b —CH₃ —NH₂ —H —H 0 E158 a or b —CH₃ —N(H)CH₃ —H —H 0 E159 a or b —CH₃ —N(CH₃)₂ —H —H 0 E160 a or b —CH₃ —NHC(O)CH₃ —H —H 0 E161 a or b —CH₃ —OCH₃ —H —H 0 E162 a or b —CH₃ —NH₂ —H —CH₃ 0 E163 a or b —CH₃ —N(H)CH₃ —H —CH₃ 0 E164 a or b —CH₃ —N(CH₃)₂ —H —CH₃ 0 E165 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ 0 E166 a or b —CH₃ —OCH₃ —H —CH₃ 0 E167 a or b —CH₃ —NH₂ —H —CH₂CH₃ 0 E168 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ 0 E169 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ 0 E170 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ 0 E171 a or b —CH₃ —OCH₃ —H —CH₂CH₃ 0 E172 a or b —CH₃ —NH₂ —CH₃ —H 0 E173 a or b —CH₃ —N(H)CH₃ —CH₃ —H 0 E174 a or b —CH₃ —N(CH₃)₂ —CH₃ —H 0 E175 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H 0 E176 a or b —CH₃ —OCH₃ —CH₃ —H 0 E177 a or b —CH₃ —NH₂ —CH₃ —CH₃ 0 E178 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ 0 E179 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ 0 E180 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ 0 E181 a or b —CH₃ —OCH₃ —CH₃ —CH₃ 0 E182 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ 0 E183 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ 0 E184 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ 0 E185 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ 0 E186 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ 0 E187 a or b —C(O)OH —NH₂ —H —H 0 E188 a or b —C(O)OH —N(H)CH₃ —H —H 0 E189 a or b —C(O)OH —N(CH₃)₂ —H —H 0 E190 a or b —C(O)OH —NHC(O)CH₃ —H —H 0 E191 a or b —C(O)OH —OCH₃ —H —H 0 E192 a or b —C(O)OH —NH₂ —H —CH₃ 0 E193 a or b —C(O)OH —N(H)CH₃ —H —CH₃ 0 E194 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ 0 E195 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ 0 E196 a or b —C(O)OH —OCH₃ —H —CH₃ 0 E197 a or b —C(O)OH —NH₂ —H —CH₂CH₃ 0 E198 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ 0 E199 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 0 E200 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 0 E201 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ 0 E202 a or b —C(O)OH —NH₂ —CH₃ —H 0 E203 a or b —C(O)OH —N(H)CH₃ —CH₃ —H 0 E204 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H 0 E205 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H 0 E206 a or b —C(O)OH —OCH₃ —CH₃ —H 0 E207 a or b —C(O)OH —NH₂ —CH₃ —CH₃ 0 E208 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ 0 E209 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 0 E210 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 0 E211 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ 0 E212 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ 0 E213 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 0 E214 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 0 E215 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 0 E216 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 0 E217 a or b —CH₂C(O)OH —NH₂ —H —H 0 E218 a or b —CH₂C(O)OH —N(H)CH₃ —H —H 0 E219 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H 0 E220 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H 0 E221 a or b —CH₂C(O)OH —OCH₃ —H —H 0 E222 a or b —CH₂C(O)OH —NH₂ —H —CH₃ 0 E223 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ 0 E224 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ 0 E225 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ 0 E226 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ 0 E227 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ 0 E228 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ 0 E229 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 0 E230 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 0 E231 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ 0 E232 a or b —CH₂C(O)OH —NH₂ —CH₃ —H 0 E233 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H 0 E234 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H 0 E235 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H 0 E236 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H 0 E237 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ 0 E238 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ 0 E239 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 0 E240 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 0 E241 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ 0 E242 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ 0 E243 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 0 E244 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 0 E245 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 0 E246 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 0 E247 a or b —H —NH₂ —H —H 1 E248 a or b —H —N(H)CH₃ —H —H 1 E249 a or b —H —N(CH₃)₂ —H —H 1 E250 a or b —H —NHC(O)CH₃ —H —H 1 E251 a or b —H —OCH₃ —H —H 1 E252 a or b —H —NH₂ —H —CH₃ 1 E253 a or b —H —N(H)CH₃ —H —CH₃ 1 E254 a or b —H —N(CH₃)₂ —H —CH₃ 1 E255 a or b —H —NHC(O)CH₃ —H —CH₃ 1 E256 a or b —H —OCH₃ —H —CH₃ 1 E257 a or b —H —NH₂ —H —CH₂CH₃ 1 E258 a or b —H —N(H)CH₃ —H —CH₂CH₃ 1 E259 a or b —H —N(CH₃)₂ —H —CH₂CH₃ 1 E260 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ 1 E261 a or b —H —OCH₃ —H —CH₂CH₃ 1 E262 a or b —H —NH₂ —CH₃ —H 1 E263 a or b —H —N(H)CH₃ —CH₃ —H 1 E264 a or b —H —N(CH₃)₂ —CH₃ —H 1 E265 a or b —H —NHC(O)CH₃ —CH₃ —H 1 E266 a or b —H —OCH₃ —CH₃ —H 1 E267 a or b —H —NH₂ —CH₃ —CH₃ 1 E268 a or b —H —N(H)CH₃ —CH₃ —CH₃ 1 E269 a or b —H —N(CH₃)₂ —CH₃ —CH₃ 1 E270 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ 1 E271 a or b —H —OCH₃ —CH₃ —CH₃ 1 E272 a or b —H —NH₂ —CH₃ —CH₂CH₃ 1 E273 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ 1 E274 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ 1 E275 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ 1 E276 a or b —H —OCH₃ —CH₃ —CH₂CH₃ 1 E277 a or b —CH₃ —NH₂ —H —H 1 E278 a or b —CH₃ —N(H)CH₃ —H —H 1 E279 a or b —CH₃ —N(CH₃)₂ —H —H 1 E280 a or b —CH₃ —NHC(O)CH₃ —H —H 1 E281 a or b —CH₃ —OCH₃ —H —H 1 E282 a or b —CH₃ —NH₂ —H —CH₃ 1 E283 a or b —CH₃ —N(H)CH₃ —H —CH₃ 1 E284 a or b —CH₃ —N(CH₃)₂ —H —CH₃ 1 E285 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ 1 E286 a or b —CH₃ —OCH₃ —H —CH₃ 1 E287 a or b —CH₃ —NH₂ —H —CH₂CH₃ 1 E288 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ 1 E289 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ 1 E290 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ 1 E291 a or b —CH₃ —OCH₃ —H —CH₂CH₃ 1 E292 a or b —CH₃ —NH₂ —CH₃ —H 1 E293 a or b —CH₃ —N(H)CH₃ —CH₃ —H 1 E294 a or b —CH₃ —N(CH₃)₂ —CH₃ —H 1 E295 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H 1 E296 a or b —CH₃ —OCH₃ —CH₃ —H 1 E297 a or b —CH₃ —NH₂ —CH₃ —CH₃ 1 E298 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ 1 E299 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ 1 E300 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ 1 E301 a or b —CH₃ —OCH₃ —CH₃ —CH₃ 1 E302 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ 1 E303 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ 1 E304 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ 1 E305 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ 1 E306 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ 1 E307 a or b —C(O)OH —NH₂ —H —H 1 E308 a or b —C(O)OH —N(H)CH₃ —H —H 1 E309 a or b —C(O)OH —N(CH₃)₂ —H —H 1 E310 a or b —C(O)OH —NHC(O)CH₃ —H —H 1 E311 a or b —C(O)OH —OCH₃ —H —H 1 E312 a or b —C(O)OH —NH₂ —H —CH₃ 1 E313 a or b —C(O)OH —N(H)CH₃ —H —CH₃ 1 E314 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ 1 E315 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ 1 E316 a or b —C(O)OH —OCH₃ —H —CH₃ 1 E317 a or b —C(O)OH —NH₂ —H —CH₂CH₃ 1 E318 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ 1 E319 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 1 E320 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 1 E321 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ 1 E322 a or b —C(O)OH —NH₂ —CH₃ —H 1 E323 a or b —C(O)OH —N(H)CH₃ —CH₃ —H 1 E324 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H 1 E325 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H 1 E326 a or b —C(O)OH —OCH₃ —CH₃ —H 1 E327 a or b —C(O)OH —NH₂ —CH₃ —CH₃ 1 E328 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ 1 E329 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 1 E330 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 1 E331 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ 1 E332 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ 1 E333 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 1 E334 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 1 E335 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 1 E336 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 1 E337 a or b —CH₂C(O)OH —NH₂ —H —H 1 E338 a or b —CH₂C(O)OH —N(H)CH₃ —H —H 1 E339 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H 1 E340 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H 1 E341 a or b —CH₂C(O)OH —OCH₃ —H —H 1 E342 a or b —CH₂C(O)OH —NH₂ —H —CH₃ 1 E343 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ 1 E344 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ 1 E345 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ 1 E346 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ 1 E347 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ 1 E348 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ 1 E349 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 1 E350 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 1 E351 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ 1 E352 a or b —CH₂C(O)OH —NH₂ —CH₃ —H 1 E353 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H 1 E354 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H 1 E355 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H 1 E356 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H 1 E357 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ 1 E358 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ 1 E359 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 1 E360 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 1 E361 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ 1 E362 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ 1 E363 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 1 E364 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 1 E365 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 1 E366 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 1 E367 a or b —H —NH₂ —H —H 2 E368 a or b —H —N(H)CH₃ —H —H 2 E369 a or b —H —N(CH₃)₂ —H —H 2 E370 a or b —H —NHC(O)CH₃ —H —H 2 E371 a or b —H —OCH₃ —H —H 2 E372 a or b —H —NH₂ —H —CH₃ 2 E373 a or b —H —N(H)CH₃ —H —CH₃ 2 E374 a or b —H —N(CH₃)₂ —H —CH₃ 2 E375 a or b —H —NHC(O)CH₃ —H —CH₃ 2 E376 a or b —H —OCH₃ —H —CH₃ 2 E377 a or b —H —NH₂ —H —CH₂CH₃ 2 E378 a or b —H —N(H)CH₃ —H —CH₂CH₃ 2 E379 a or b —H —N(CH₃)₂ —H —CH₂CH₃ 2 E380 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ 2 E381 a or b —H —OCH₃ —H —CH₂CH₃ 2 E382 a or b —H —NH₂ —CH₃ —H 2 E383 a or b —H —N(H)CH₃ —CH₃ —H 2 E384 a or b —H —N(CH₃)₂ —CH₃ —H 2 E385 a or b —H —NHC(O)CH₃ —CH₃ —H 2 E386 a or b —H —OCH₃ —CH₃ —H 2 E387 a or b —H —NH₂ —CH₃ —CH₃ 2 E388 a or b —H —N(H)CH₃ —CH₃ —CH₃ 2 E389 a or b —H —N(CH₃)₂ —CH₃ —CH₃ 2 E390 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ 2 E391 a or b —H —OCH₃ —CH₃ —CH₃ 2 E392 a or b —H —NH₂ —CH₃ —CH₂CH₃ 2 E393 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ 2 E394 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ 2 E395 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ 2 E396 a or b —H —OCH₃ —CH₃ —CH₂CH₃ 2 E397 a or b —CH₃ —NH₂ —H —H 2 E398 a or b —CH₃ —N(H)CH₃ —H —H 2 E399 a or b —CH₃ —N(CH₃)₂ —H —H 2 E400 a or b —CH₃ —NHC(O)CH₃ —H —H 2 E401 a or b —CH₃ —OCH₃ —H —H 2 E402 a or b —CH₃ —NH₂ —H —CH₃ 2 E403 a or b —CH₃ —N(H)CH₃ —H —CH₃ 2 E404 a or b —CH₃ —N(CH₃)₂ —H —CH₃ 2 E405 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ 2 E406 a or b —CH₃ —OCH₃ —H —CH₃ 2 E407 a or b —CH₃ —NH₂ —H —CH₂CH₃ 2 E408 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ 2 E409 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ 2 E410 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ 2 E411 a or b —CH₃ —OCH₃ —H —CH₂CH₃ 2 E412 a or b —CH₃ —NH₂ —CH₃ —H 2 E413 a or b —CH₃ —N(H)CH₃ —CH₃ —H 2 E414 a or b —CH₃ —N(CH₃)₂ —CH₃ —H 2 E415 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H 2 E416 a or b —CH₃ —OCH₃ —CH₃ —H 2 E417 a or b —CH₃ —NH₂ —CH₃ —CH₃ 2 E418 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ 2 E419 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ 2 E420 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ 2 E421 a or b —CH₃ —OCH₃ —CH₃ —CH₃ 2 E422 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ 2 E423 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ 2 E424 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ 2 E425 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ 2 E426 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ 2 E427 a or b —C(O)OH —NH₂ —H —H 2 E428 a or b —C(O)OH —N(H)CH₃ —H —H 2 E429 a or b —C(O)OH —N(CH₃)₂ —H —H 2 E430 a or b —C(O)OH —NHC(O)CH₃ —H —H 2 E431 a or b —C(O)OH —OCH₃ —H —H 2 E432 a or b —C(O)OH —NH₂ —H —CH₃ 2 E433 a or b —C(O)OH —N(H)CH₃ —H —CH₃ 2 E434 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ 2 E435 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ 2 E436 a or b —C(O)OH —OCH₃ —H —CH₃ 2 E437 a or b —C(O)OH —NH₂ —H —CH₂CH₃ 2 E438 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ 2 E439 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 2 E440 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 2 E441 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ 2 E442 a or b —C(O)OH —NH₂ —CH₃ —H 2 E443 a or b —C(O)OH —N(H)CH₃ —CH₃ —H 2 E444 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H 2 E445 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H 2 E446 a or b —C(O)OH —OCH₃ —CH₃ —H 2 E447 a or b —C(O)OH —NH₂ —CH₃ —CH₃ 2 E448 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ 2 E449 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 2 E450 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 2 E451 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ 2 E452 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ 2 E453 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 2 E454 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 2 E455 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 2 E456 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 2 E457 a or b —CH₂C(O)OH —NH₂ —H —H 2 E458 a or b —CH₂C(O)OH —N(H)CH₃ —H —H 2 E459 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H 2 E460 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H 2 E461 a or b —CH₂C(O)OH —OCH₃ —H —H 2 E462 a or b —CH₂C(O)OH —NH₂ —H —CH₃ 2 E463 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ 2 E464 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ 2 E465 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ 2 E466 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ 2 E467 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ 2 E468 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ 2 E469 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 2 E470 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 2 E471 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ 2 E472 a or b —CH₂C(O)OH —NH₂ —CH₃ —H 2 E473 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H 2 E474 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H 2 E475 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H 2 E476 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H 2 E477 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ 2 E478 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ 2 E479 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 2 E480 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 2 E481 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ 2 E482 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ 2 E483 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 2 E484 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 2 E485 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 2 E486 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 2 * (i) Indicates that the carbon atom to which R_(3a) is attached is in the (R)-configuration, (ii) indicates that the carbon atom to which R_(3a) is attached is in the S-configuration, and (iii) indicates that the carbon atom to which R_(3a) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. † (iv) Indicates that the carbon atom to which R_(3b) is attached is in the (R)-configuration, (v) indicates that the carbon atom to which R_(3b) is attached is in the (S)-configuration, and (vi) indicates that the carbon atom to which R_(3b) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. ‡ (vii) Indicates that the carbon atom to which R_(3c) is attached is in the (R)-configuration, (viii) indicates that the carbon atom to which R_(3c) is attached is in the (S)-configuration, and (ix) indicates that the carbon atom to which R_(3c) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations.

TABLE 7

(a)

(b) and pharmaceutically acceptable derivatives thereof, where:

Compound R_(3a) * R_(3b) † R_(3c) ‡ R₈′ d F1 a or b —H —H —H —H 0 F2 a or b —C(O)OH —H —H —H 0 F3 a or b —H —C(O)OH —H —H 0 F4 a or b —CH₃ —H —H —H 0 F5 a or b —H —CH₃ —H —H 0 F6 a or b —CH₃ —CH₃ —H —H 0 F7 a or b —C(O)OH —CH₃ —H —H 0 F8 a or b —C(O)OH —H —CH₃ —H 0 F9 a or b —CH₃ —C(O)OH —H —H 0 F10 a or b —H —H —H —CH₃ 0 F11 a or b —C(O)OH —H —H —CH₃ 0 F12 a or b —H —C(O)OH —H —CH₃ 0 F13 a or b —CH₃ —H —H —CH₃ 0 F14 a or b —H —CH₃ —H —CH₃ 0 F15 a or b —CH₃ —CH₃ —H —CH₃ 0 F16 a or b —C(O)OH —CH₃ —H —CH₃ 0 F17 a or b —C(O)OH —H —CH₃ —CH₃ 0 F18 a or b —CH₃ —C(O)OH —H —CH₃ 0 F19 a or b —H —H —H —CH₂CH₃ 0 F20 a or b —C(O)OH —H —H —CH₂CH₃ 0 F21 a or b —H —C(O)OH —H —CH₂CH₃ 0 F22 a or b —CH₃ —H —H —CH₂CH₃ 0 F23 a or b —H —CH₃ —H —CH₂CH₃ 0 F24 a or b —CH₃ —CH₃ —H —CH₂CH₃ 0 F25 a or b —C(O)OH —CH₃ —H —CH₂CH₃ 0 F26 a or b —C(O)OH —H —CH₃ —CH₂CH₃ 0 F27 a or b —CH₃ —C(O)OH —H —CH₂CH₃ 0 F28 a or b —CH₂C(O)OH —H —H —H 0 F29 a or b —H —CH₂C(O)OH —H —H 0 F30 a or b —CH₂C(O)OH —CH₃ —H —H 0 F31 a or b —CH₂C(O)OH —H —CH₃ —H 0 F32 a or b —CH₃ —CH₂C(O)OH —H —H 0 F33 a or b —CH₂C(O)OH —H —H —CH₃ 0 F34 a or b —H —CH₂C(O)OH —H —CH₃ 0 F35 a or b —CH₂C(O)OH —CH₃ —H —CH₃ 0 F36 a or b —CH₂C(O)OH —H —CH₃ —CH₃ 0 F37 a or b —CH₃ —CH₂C(O)OH —H —CH₃ 0 F38 a or b —CH₂C(O)OH —H —H —CH₂CH₃ 0 F39 a or b —H —CH₂C(O)OH —H —CH₂CH₃ 0 F40 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ 0 F41 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ 0 F42 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ 0 F43 a or b —H —H —H —H 1 F44 a or b —C(O)OH —H —H —H 1 F45 a or b —H —C(O)OH —H —H 1 F46 a or b —CH₃ —H —H —H 1 F47 a or b —H —CH₃ —H —H 1 F48 a or b —CH₃ —CH₃ —H —H 1 F49 a or b —C(O)OH —CH₃ —H —H 1 F50 a or b —C(O)OH —H —CH₃ —H 1 F51 a or b —CH₃ —C(O)OH —H —H 1 F52 a or b —H —H —H —CH₃ 1 F53 a or b —C(O)OH —H —H —CH₃ 1 F54 a or b —H —C(O)OH —H —CH₃ 1 F55 a or b —CH₃ —H —H —CH₃ 1 F56 a or b —H —CH₃ —H —CH₃ 1 F57 a or b —CH₃ —CH₃ —H —CH₃ 1 F58 a or b —C(O)OH —CH₃ —H —CH₃ 1 F59 a or b —C(O)OH —H —CH₃ —CH₃ 1 F60 a or b —CH₃ —C(O)OH —H —CH₃ 1 F61 a or b —H —H —H —CH₂CH₃ 1 F62 a or b —C(O)OH —H —H —CH₂CH₃ 1 F63 a or b —H —C(O)OH —H —CH₂CH₃ 1 F64 a or b —CH₃ —H —H —CH₂CH₃ 1 F65 a or b —H —CH₃ —H —CH₂CH₃ 1 F66 a or b —CH₃ —CH₃ —H —CH₂CH₃ 1 F67 a or b —C(O)OH —CH₃ —H —CH₂CH₃ 1 F68 a or b —C(O)OH —H —CH₃ —CH₂CH₃ 1 F69 a or b —CH₃ —C(O)OH —H —CH₂CH₃ 1 F70 a or b —CH₂C(O)OH —H —H —H 1 F71 a or b —H —CH₂C(O)OH —H —H 1 F72 a or b —CH₂C(O)OH —CH₃ —H —H 1 F73 a or b —CH₂C(O)OH —H —CH₃ —H 1 F74 a or b —CH₃ —CH₂C(O)OH —H —H 1 F75 a or b —CH₂C(O)OH —H —H —CH₃ 1 F76 a or b —H —CH₂C(O)OH —H —CH₃ 1 F77 a or b —CH₂C(O)OH —CH₃ —H —CH₃ 1 F78 a or b —CH₂C(O)OH —H —CH₃ —CH₃ 1 F79 a or b —CH₃ —CH₂C(O)OH —H —CH₃ 1 F80 a or b —CH₂C(O)OH —H —H —CH₂CH₃ 1 F81 a or b —H —CH₂C(O)OH —H —CH₂CH₃ 1 F82 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ 1 F83 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ 1 F84 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ 1 F85 a or b —H —H —H —H 2 F86 a or b —C(O)OH —H —H —H 2 F87 a or b —H —C(O)OH —H —H 2 F88 a or b —CH₃ —H —H —H 2 F89 a or b —H —CH₃ —H —H 2 F90 a or b —CH₃ —CH₃ —H —H 2 F91 a or b —C(O)OH —CH₃ —H —H 2 F92 a or b —C(O)OH —H —CH₃ —H 2 F93 a or b —CH₃ —C(O)OH —H —H 2 F94 a or b —H —H —H —CH₃ 2 F95 a or b —C(O)OH —H —H —CH₃ 2 F96 a or b —H —C(O)OH —H —CH₃ 2 F97 a or b —CH₃ —H —H —CH₃ 2 F98 a or b —H —CH₃ —H —CH₃ 2 F99 a or b —CH₃ —CH₃ —H —CH₃ 2 F100 a or b —C(O)OH —CH₃ —H —CH₃ 2 F101 a or b —C(O)OH —H —CH₃ —CH₃ 2 F102 a or b —CH₃ —C(O)OH —H —CH₃ 2 F103 a or b —H —H —H —CH₂CH₃ 2 F104 a or b —C(O)OH —H —H —CH₂CH₃ 2 F105 a or b —H —C(O)OH —H —CH₂CH₃ 2 F106 a or b —CH₃ —H —H —CH₂CH₃ 2 F107 a or b —H —CH₃ —H —CH₂CH₃ 2 F108 a or b —CH₃ —CH₃ —H —CH₂CH₃ 2 F109 a or b —C(O)OH —CH₃ —H —CH₂CH₃ 2 F110 a or b —C(O)OH —H —CH₃ —CH₂CH₃ 2 F111 a or b —CH₃ —C(O)OH —H —CH₂CH₃ 2 F112 a or b —CH₂C(O)OH —H —H —H 2 F113 a or b —H —CH₂C(O)OH —H —H 2 F114 a or b —CH₂C(O)OH —CH₃ —H —H 2 F115 a or b —CH₂C(O)OH —H —CH₃ —H 2 F116 a or b —CH₃ —CH₂C(O)OH —H —H 2 F117 a or b —CH₂C(O)OH —H —H —CH₃ 2 F118 a or b —H —CH₂C(O)OH —H —CH₃ 2 F119 a or b —CH₂C(O)OH —CH₃ —H —CH₃ 2 F120 a or b —CH₂C(O)OH —H —CH₃ —CH₃ 2 F121 a or b —CH₃ —CH₂C(O)OH —H —CH₃ 2 F122 a or b —CH₂C(O)OH —H —H —CH₂CH₃ 2 F123 a or b —H —CH₂C(O)OH —H —CH₂CH₃ 2 F124 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ 2 F125 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ 2 F126 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ 2 F127 a or b —H —NH₂ —H —H 0 F128 a or b —H —N(H)CH₃ —H —H 0 F129 a or b —H —N(CH₃)₂ —H —H 0 F130 a or b —H —NHC(O)CH₃ —H —H 0 F131 a or b —H —OCH₃ —H —H 0 F132 a or b —H —NH₂ —H —CH₃ 0 F133 a or b —H —N(H)CH₃ —H —CH₃ 0 F134 a or b —H —N(CH₃)₂ —H —CH₃ 0 F135 a or b —H —NHC(O)CH₃ —H —CH₃ 0 F136 a or b —H —OCH₃ —H —CH₃ 0 F137 a or b —H —NH₂ —H —CH₂CH₃ 0 F138 a or b —H —N(H)CH₃ —H —CH₂CH₃ 0 F139 a or b —H —N(CH₃)₂ —H —CH₂CH₃ 0 F140 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ 0 F141 a or b —H —OCH₃ —H —CH₂CH₃ 0 F142 a or b —H —NH₂ —CH₃ —H 0 F143 a or b —H —N(H)CH₃ —CH₃ —H 0 F144 a or b —H —N(CH₃)₂ —CH₃ —H 0 F145 a or b —H —NHC(O)CH₃ —CH₃ —H 0 F146 a or b —H —OCH₃ —CH₃ —H 0 F147 a or b —H —NH₂ —CH₃ —CH₃ 0 F148 a or b —H —N(H)CH₃ —CH₃ —CH₃ 0 F149 a or b —H —N(CH₃)₂ —CH₃ —CH₃ 0 F150 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ 0 F151 a or b —H —OCH₃ —CH₃ —CH₃ 0 F152 a or b —H —NH₂ —CH₃ —CH₂CH₃ 0 F153 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ 0 F154 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ 0 F155 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ 0 F156 a or b —H —OCH₃ —CH₃ —CH₂CH₃ 0 F157 a or b —CH₃ —NH₂ —H —H 0 F158 a or b —CH₃ —N(H)CH₃ —H —H 0 F159 a or b —CH₃ —N(CH₃)₂ —H —H 0 F160 a or b —CH₃ —NHC(O)CH₃ —H —H 0 F161 a or b —CH₃ —OCH₃ —H —H 0 F162 a or b —CH₃ —NH₂ —H —CH₃ 0 F163 a or b —CH₃ —N(H)CH₃ —H —CH₃ 0 F164 a or b —CH₃ —N(CH₃)₂ —H —CH₃ 0 F165 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ 0 F166 a or b —CH₃ —OCH₃ —H —CH₃ 0 F167 a or b —CH₃ —NH₂ —H —CH₂CH₃ 0 F168 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ 0 F169 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ 0 F170 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ 0 F171 a or b —CH₃ —OCH₃ —H —CH₂CH₃ 0 F172 a or b —CH₃ —NH₂ —CH₃ —H 0 F173 a or b —CH₃ —N(H)CH₃ —CH₃ —H 0 F174 a or b —CH₃ —N(CH₃)₂ —CH₃ —H 0 F175 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H 0 F176 a or b —CH₃ —OCH₃ —CH₃ —H 0 F177 a or b —CH₃ —NH₂ —CH₃ —CH₃ 0 F178 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ 0 F179 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ 0 F180 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ 0 F181 a or b —CH₃ —OCH₃ —CH₃ —CH₃ 0 F182 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ 0 F183 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ 0 F184 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ 0 F185 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ 0 F186 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ 0 F187 a or b —C(O)OH —NH₂ —H —H 0 F188 a or b —C(O)OH —N(H)CH₃ —H —H 0 F189 a or b —C(O)OH —N(CH₃)₂ —H —H 0 F190 a or b —C(O)OH —NHC(O)CH₃ —H —H 0 F191 a or b —C(O)OH —OCH₃ —H —H 0 F192 a or b —C(O)OH —NH₂ —H —CH₃ 0 F193 a or b —C(O)OH —N(H)CH₃ —H —CH₃ 0 F194 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ 0 F195 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ 0 F196 a or b —C(O)OH —OCH₃ —H —CH₃ 0 F197 a or b —C(O)OH —NH₂ —H —CH₂CH₃ 0 F198 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ 0 F199 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 0 F200 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 0 F201 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ 0 F202 a or b —C(O)OH —NH₂ —CH₃ —H 0 F203 a or b —C(O)OH —N(H)CH₃ —CH₃ —H 0 F204 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H 0 F205 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H 0 F206 a or b —C(O)OH —OCH₃ —CH₃ —H 0 F207 a or b —C(O)OH —NH₂ —CH₃ —CH₃ 0 F208 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ 0 F209 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 0 F210 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 0 F211 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ 0 F212 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ 0 F213 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 0 F214 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 0 F215 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 0 F216 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 0 F217 a or b —CH₂C(O)OH —NH₂ —H —H 0 F218 a or b —CH₂C(O)OH —N(H)CH₃ —H —H 0 F219 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H 0 F220 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H 0 F221 a or b —CH₂C(O)OH —OCH₃ —H —H 0 F222 a or b —CH₂C(O)OH —NH₂ —H —CH₃ 0 F223 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ 0 F224 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ 0 F225 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ 0 F226 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ 0 F227 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ 0 F228 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ 0 F229 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 0 F230 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 0 F231 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ 0 F232 a or b —CH₂C(O)OH —NH₂ —CH₃ —H 0 F233 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H 0 F234 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H 0 F235 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H 0 F236 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H 0 F237 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ 0 F238 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ 0 F239 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 0 F240 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 0 F241 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ 0 F242 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ 0 F243 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 0 F244 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 0 F245 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 0 F246 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 0 F247 a or b —H —NH₂ —H —H 1 F248 a or b —H —N(H)CH₃ —H —H 1 F249 a or b —H —N(CH₃)₂ —H —H 1 F250 a or b —H —NHC(O)CH₃ —H —H 1 F251 a or b —H —OCH₃ —H —H 1 F252 a or b —H —NH₂ —H —CH₃ 1 F253 a or b —H —N(H)CH₃ —H —CH₃ 1 F254 a or b —H —N(CH₃)₂ —H —CH₃ 1 F255 a or b —H —NHC(O)CH₃ —H —CH₃ 1 F256 a or b —H —OCH₃ —H —CH₃ 1 F257 a or b —H —NH₂ —H —CH₂CH₃ 1 F258 a or b —H —N(H)CH₃ —H —CH₂CH₃ 1 F259 a or b —H —N(CH₃)₂ —H —CH₂CH₃ 1 F260 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ 1 F261 a or b —H —OCH₃ —H —CH₂CH₃ 1 F262 a or b —H —NH₂ —CH₃ —H 1 F263 a or b —H —N(H)CH₃ —CH₃ —H 1 F264 a or b —H —N(CH₃)₂ —CH₃ —H 1 F265 a or b —H —NHC(O)CH₃ —CH₃ —H 1 F266 a or b —H —OCH₃ —CH₃ —H 1 F267 a or b —H —NH₂ —CH₃ —CH₃ 1 F268 a or b —H —N(H)CH₃ —CH₃ —CH₃ 1 F269 a or b —H —N(CH₃)₂ —CH₃ —CH₃ 1 F270 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ 1 F271 a or b —H —OCH₃ —CH₃ —CH₃ 1 F272 a or b —H —NH₂ —CH₃ —CH₂CH₃ 1 F273 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ 1 F274 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ 1 F275 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ 1 F276 a or b —H —OCH₃ —CH₃ —CH₂CH₃ 1 F277 a or b —CH₃ —NH₂ —H —H 1 F278 a or b —CH₃ —N(H)CH₃ —H —H 1 F279 a or b —CH₃ —N(CH₃)₂ —H —H 1 F280 a or b —CH₃ —NHC(O)CH₃ —H —H 1 F281 a or b —CH₃ —OCH₃ —H —H 1 F282 a or b —CH₃ —NH₂ —H —CH₃ 1 F283 a or b —CH₃ —N(H)CH₃ —H —CH₃ 1 F284 a or b —CH₃ —N(CH₃)₂ —H —CH₃ 1 F285 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ 1 F286 a or b —CH₃ —OCH₃ —H —CH₃ 1 F287 a or b —CH₃ —NH₂ —H —CH₂CH₃ 1 F288 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ 1 F289 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ 1 F290 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ 1 F291 a or b —CH₃ —OCH₃ —H —CH₂CH₃ 1 F292 a or b —CH₃ —NH₂ —CH₃ —H 1 F293 a or b —CH₃ —N(H)CH₃ —CH₃ —H 1 F294 a or b —CH₃ —N(CH₃)₂ —CH₃ —H 1 F295 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H 1 F296 a or b —CH₃ —OCH₃ —CH₃ —H 1 F297 a or b —CH₃ —NH₂ —CH₃ —CH₃ 1 F298 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ 1 F299 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ 1 F300 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ 1 F301 a or b —CH₃ —OCH₃ —CH₃ —CH₃ 1 F302 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ 1 F303 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ 1 F304 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ 1 F305 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ 1 F306 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ 1 F307 a or b —C(O)OH —NH₂ —H —H 1 F308 a or b —C(O)OH —N(H)CH₃ —H —H 1 F309 a or b —C(O)OH —N(CH₃)₂ —H —H 1 F310 a or b —C(O)OH —NHC(O)CH₃ —H —H 1 F311 a or b —C(O)OH —OCH₃ —H —H 1 F312 a or b —C(O)OH —NH₂ —H —CH₃ 1 F313 a or b —C(O)OH —N(H)CH₃ —H —CH₃ 1 F314 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ 1 F315 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ 1 F316 a or b —C(O)OH —OCH₃ —H —CH₃ 1 F317 a or b —C(O)OH —NH₂ —H —CH₂CH₃ 1 F318 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ 1 F319 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 1 F320 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 1 F321 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ 1 F322 a or b —C(O)OH —NH₂ —CH₃ —H 1 F323 a or b —C(O)OH —N(H)CH₃ —CH₃ —H 1 F324 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H 1 F325 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H 1 F326 a or b —C(O)OH —OCH₃ —CH₃ —H 1 F327 a or b —C(O)OH —NH₂ —CH₃ —CH₃ 1 F328 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ 1 F329 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 1 F330 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 1 F331 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ 1 F332 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ 1 F333 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 1 F334 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 1 F335 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 1 F336 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 1 F337 a or b —CH₂C(O)OH —NH₂ —H —H 1 F338 a or b —CH₂C(O)OH —N(H)CH₃ —H —H 1 F339 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H 1 F340 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H 1 F341 a or b —CH₂C(O)OH —OCH₃ —H —H 1 F342 a or b —CH₂C(O)OH —NH₂ —H —CH₃ 1 F343 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ 1 F344 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ 1 F345 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ 1 F346 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ 1 F347 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ 1 F348 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ 1 F349 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 1 F350 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 1 F351 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ 1 F352 a or b —CH₂C(O)OH —NH₂ —CH₃ —H 1 F353 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H 1 F354 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H 1 F355 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H 1 F356 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H 1 F357 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ 1 F358 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ 1 F359 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 1 F360 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 1 F361 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ 1 F362 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ 1 F363 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 1 F364 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 1 F365 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 1 F366 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 1 F367 a or b —H —NH₂ —H —H 2 F368 a or b —H —N(H)CH₃ —H —H 2 F369 a or b —H —N(CH₃)₂ —H —H 2 F370 a or b —H —NHC(O)CH₃ —H —H 2 F371 a or b —H —OCH₃ —H —H 2 F372 a or b —H —NH₂ —H —CH₃ 2 F373 a or b —H —N(H)CH₃ —H —CH₃ 2 F374 a or b —H —N(CH₃)₂ —H —CH₃ 2 F375 a or b —H —NHC(O)CH₃ —H —CH₃ 2 F376 a or b —H —OCH₃ —H —CH₃ 2 F377 a or b —H —NH₂ —H —CH₂CH₃ 2 F378 a or b —H —N(H)CH₃ —H —CH₂CH₃ 2 F379 a or b —H —N(CH₃)₂ —H —CH₂CH₃ 2 F380 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ 2 F381 a or b —H —OCH₃ —H —CH₂CH₃ 2 F382 a or b —H —NH₂ —CH₃ —H 2 F383 a or b —H —N(H)CH₃ —CH₃ —H 2 F384 a or b —H —N(CH₃)₂ —CH₃ —H 2 F385 a or b —H —NHC(O)CH₃ —CH₃ —H 2 F386 a or b —H —OCH₃ —CH₃ —H 2 F387 a or b —H —NH₂ —CH₃ —CH₃ 2 F388 a or b —H —N(H)CH₃ —CH₃ —CH₃ 2 F389 a or b —H —N(CH₃)₂ —CH₃ —CH₃ 2 F390 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ 2 F391 a or b —H —OCH₃ —CH₃ —CH₃ 2 F392 a or b —H —NH₂ —CH₃ —CH₂CH₃ 2 F393 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ 2 F394 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ 2 F395 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ 2 F396 a or b —H —OCH₃ —CH₃ —CH₂CH₃ 2 F397 a or b —CH₃ —NH₂ —H —H 2 F398 a or b —CH₃ —N(H)CH₃ —H —H 2 F399 a or b —CH₃ —N(CH₃)₂ —H —H 2 F400 a or b —CH₃ —NHC(O)CH₃ —H —H 2 F401 a or b —CH₃ —OCH₃ —H —H 2 F402 a or b —CH₃ —NH₂ —H —CH₃ 2 F403 a or b —CH₃ —N(H)CH₃ —H —CH₃ 2 F404 a or b —CH₃ —N(CH₃)₂ —H —CH₃ 2 F405 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ 2 F406 a or b —CH₃ —OCH₃ —H —CH₃ 2 F407 a or b —CH₃ —NH₂ —H —CH₂CH₃ 2 F408 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ 2 F409 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ 2 F410 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ 2 F411 a or b —CH₃ —OCH₃ —H —CH₂CH₃ 2 F412 a or b —CH₃ —NH₂ —CH₃ —H 2 F413 a or b —CH₃ —N(H)CH₃ —CH₃ —H 2 F414 a or b —CH₃ —N(CH₃)₂ —CH₃ —H 2 F415 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H 2 F416 a or b —CH₃ —OCH₃ —CH₃ —H 2 F417 a or b —CH₃ —NH₂ —CH₃ —CH₃ 2 F418 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ 2 F419 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ 2 F420 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ 2 F421 a or b —CH₃ —OCH₃ —CH₃ —CH₃ 2 F422 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ 2 F423 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ 2 F424 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ 2 F425 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ 2 F426 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ 2 F427 a or b —C(O)OH —NH₂ —H —H 2 F428 a or b —C(O)OH —N(H)CH₃ —H —H 2 F429 a or b —C(O)OH —N(CH₃)₂ —H —H 2 F430 a or b —C(O)OH —NHC(O)CH₃ —H —H 2 F431 a or b —C(O)OH —OCH₃ —H —H 2 F432 a or b —C(O)OH —NH₂ —H —CH₃ 2 F433 a or b —C(O)OH —N(H)CH₃ —H —CH₃ 2 F434 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ 2 F435 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ 2 F436 a or b —C(O)OH —OCH₃ —H —CH₃ 2 F437 a or b —C(O)OH —NH₂ —H —CH₂CH₃ 2 F438 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ 2 F439 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 2 F440 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 2 F441 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ 2 F442 a or b —C(O)OH —NH₂ —CH₃ —H 2 F443 a or b —C(O)OH —N(H)CH₃ —CH₃ —H 2 F444 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H 2 F445 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H 2 F446 a or b —C(O)OH —OCH₃ —CH₃ —H 2 F447 a or b —C(O)OH —NH₂ —CH₃ —CH₃ 2 F448 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ 2 F449 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 2 F450 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 2 F451 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ 2 F452 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ 2 F453 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 2 F454 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 2 F455 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 2 F456 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 2 F457 a or b —CH₂C(O)OH —NH₂ —H —H 2 F458 a or b —CH₂C(O)OH —N(H)CH₃ —H —H 2 F459 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H 2 F460 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H 2 F461 a or b —CH₂C(O)OH —OCH₃ —H —H 2 F462 a or b —CH₂C(O)OH —NH₂ —H —CH₃ 2 F463 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ 2 F464 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ 2 F465 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ 2 F466 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ 2 F467 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ 2 F468 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ 2 F469 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ 2 F470 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ 2 F471 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ 2 F472 a or b —CH₂C(O)OH —NH₂ —CH₃ —H 2 F473 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H 2 F474 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H 2 F475 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H 2 F476 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H 2 F477 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ 2 F478 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ 2 F479 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ 2 F480 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ 2 F481 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ 2 F482 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ 2 F483 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ 2 F484 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ 2 F485 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ 2 F486 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ 2 * (i) Indicates that the carbon atom to which R_(3a) is attached is in the (R)-configuration, (ii) indicates that the carbon atom to which R_(3a) is attached is in the S-configuration, and (iii) indicates that the carbon atom to which R_(3a) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. † (iv) Indicates that the carbon atom to which R_(3b) is attached is in the (R)-configuration, (v) indicates that the carbon atom to which R_(3b) is attached is in the (S)-configuration, and (vi) indicates that the carbon atom to which R_(3b) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. ‡ (vii) Indicates that the carbon atom to which R_(3c) is attached is in the (R)-configuration, (viii) indicates that the carbon atom to which R_(3c) is attached is in the (S)-configuration, and (ix) indicates that the carbon atom to which R_(3c) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations.

TABLE 8

(a)

(b) and pharmaceutically acceptable derivatives thereof, where:

Compound R_(3a) * R_(3b) † R_(3c) ‡ R₈′ G1 a or b —H —H —H —H G2 a or b —C(O)OH —H —H —H G3 a or b —H —C(O)OH —H —H G4 a or b —CH₃ —H —H —H G5 a or b —H —CH₃ —H —H G6 a or b —CH₃ —CH₃ —H —H G7 a or b —C(O)OH —CH₃ —H —H G8 a or b —C(O)OH —H —CH₃ —H G9 a or b —CH₃ —C(O)OH —H —H G10 a or b —H —H —H —CH₃ G11 a or b —C(O)OH —H —H —CH₃ G12 a or b —H —C(O)OH —H —CH₃ G13 a or b —CH₃ —H —H —CH₃ G14 a or b —H —CH₃ —H —CH₃ G15 a or b —CH₃ —CH₃ —H —CH₃ G16 a or b —C(O)OH —CH₃ —H —CH₃ G17 a or b —C(O)OH —H —CH₃ —CH₃ G18 a or b —CH₃ —C(O)OH —H —CH₃ G19 a or b —H —H —H —CH₂CH₃ G20 a or b —C(O)OH —H —H —CH₂CH₃ G21 a or b —H —C(O)OH —H —CH₂CH₃ G22 a or b —CH₃ —H —H —CH₂CH₃ G23 a or b —H —CH₃ —H —CH₂CH₃ G24 a or b —CH₃ —CH₃ —H —CH₂CH₃ G25 a or b —C(O)OH —CH₃ —H —CH₂CH₃ G26 a or b —C(O)OH —H —CH₃ —CH₂CH₃ G27 a or b —CH₃ —C(O)OH —H —CH₂CH₃ G28 a or b —CH₂C(O)OH —H —H —H G29 a or b —H —CH₂C(O)OH —H —H G30 a or b —CH₂C(O)OH —CH₃ —H —H G31 a or b —CH₂C(O)OH —H —CH₃ —H G32 a or b —CH₃ —CH₂C(O)OH —H —H G33 a or b —CH₂C(O)OH —H —H —CH₃ G34 a or b —H —CH₂C(O)OH —H —CH₃ G35 a or b —CH₂C(O)OH —CH₃ —H —CH₃ G36 a or b —CH₂C(O)OH —H —CH₃ —CH₃ G37 a or b —CH₃ —CH₂C(O)OH —H —CH₃ G38 a or b —CH₂C(O)OH —H —H —CH₂CH₃ G39 a or b —H —CH₂C(O)OH —H —CH₂CH₃ G40 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ G41 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ G42 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ G43 a or b —H —NH₂ —H —H G44 a or b —H —N(H)CH₃ —H —H G45 a or b —H —N(CH₃)₂ —H —H G46 a or b —H —NHC(O)CH₃ —H —H G47 a or b —H —OCH₃ —H —H G48 a or b —H —NH₂ —H —CH₃ G49 a or b —H —N(H)CH₃ —H —CH₃ G50 a or b —H —N(CH₃)₂ —H —CH₃ G51 a or b —H —NHC(O)CH₃ —H —CH₃ G52 a or b —H —OCH₃ —H —CH₃ G53 a or b —H —NH₂ —H —CH₂CH₃ G54 a or b —H —N(H)CH₃ —H —CH₂CH₃ G55 a or b —H —N(CH₃)₂ —H —CH₂CH₃ G56 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ G57 a or b —H —OCH₃ —H —CH₂CH₃ G58 a or b —H —NH₂ —CH₃ —H G59 a or b —H —N(H)CH₃ —CH₃ —H G60 a or b —H —N(CH₃)₂ —CH₃ —H G61 a or b —H —NHC(O)CH₃ —CH₃ —H G62 a or b —H —OCH₃ —CH₃ —H G63 a or b —H —NH₂ —CH₃ —CH₃ G64 a or b —H —N(H)CH₃ —CH₃ —CH₃ G65 a or b —H —N(CH₃)₂ —CH₃ —CH₃ G66 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ G67 a or b —H —OCH₃ —CH₃ —CH₃ G68 a or b —H —NH₂ —CH₃ —CH₂CH₃ G69 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ G70 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ G71 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ G72 a or b —H —OCH₃ —CH₃ —CH₂CH₃ G73 a or b —CH₃ —NH₂ —H —H G74 a or b —CH₃ —N(H)CH₃ —H —H G75 a or b —CH₃ —N(CH₃)₂ —H —H G76 a or b —CH₃ —NHC(O)CH₃ —H —H G77 a or b —CH₃ —OCH₃ —H —H G78 a or b —CH₃ —NH₂ —H —CH₃ G79 a or b —CH₃ —N(H)CH₃ —H —CH₃ G80 a or b —CH₃ —N(CH₃)₂ —H —CH₃ G81 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ G82 a or b —CH₃ —OCH₃ —H —CH₃ G83 a or b —CH₃ —NH₂ —H —CH₂CH₃ G84 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ G85 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ G86 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ G87 a or b —CH₃ —OCH₃ —H —CH₂CH₃ G88 a or b —CH₃ —NH₂ —CH₃ —H G89 a or b —CH₃ —N(H)CH₃ —CH₃ —H G90 a or b —CH₃ —N(CH₃)₂ —CH₃ —H G91 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H G92 a or b —CH₃ —OCH₃ —CH₃ —H G93 a or b —CH₃ —NH₂ —CH₃ —CH₃ G94 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ G95 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ G96 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ G97 a or b —CH₃ —OCH₃ —CH₃ —CH₃ G98 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ G99 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ G100 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ G101 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ G102 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ G103 a or b —C(O)OH —NH₂ —H —H G104 a or b —C(O)OH —N(H)CH₃ —H —H G105 a or b —C(O)OH —N(CH₃)₂ —H —H G106 a or b —C(O)OH —NHC(O)CH₃ —H —H G107 a or b —C(O)OH —OCH₃ —H —H G108 a or b —C(O)OH —NH₂ —H —CH₃ G109 a or b —C(O)OH —N(H)CH₃ —H —CH₃ G110 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ G111 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ G112 a or b —C(O)OH —OCH₃ —H —CH₃ G113 a or b —C(O)OH —NH₂ —H —CH₂CH₃ G114 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ G115 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ G116 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ G117 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ G118 a or b —C(O)OH —NH₂ —CH₃ —H G119 a or b —C(O)OH —N(H)CH₃ —CH₃ —H G120 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H G121 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H G122 a or b —C(O)OH —OCH₃ —CH₃ —H G123 a or b —C(O)OH —NH₂ —CH₃ —CH₃ G124 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ G125 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ G126 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ G127 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ G128 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ G129 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ G130 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ G131 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ G132 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ G133 a or b —CH₂C(O)OH —NH₂ —H —H G134 a or b —CH₂C(O)OH —N(H)CH₃ —H —H G135 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H G136 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H G137 a or b —CH₂C(O)OH —OCH₃ —H —H G138 a or b —CH₂C(O)OH —NH₂ —H —CH₃ G139 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ G140 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ G141 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ G142 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ G143 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ G144 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ G145 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ G146 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ G147 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ G148 a or b —CH₂C(O)OH —NH₂ —CH₃ —H G149 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H G150 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H G151 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H G152 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H G153 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ G154 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ G155 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ G156 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ G157 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ G158 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ G159 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ G160 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ G161 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ G162 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ * (i) Indicates that the carbon atom to which R_(3a) is attached is in the (R)-configuration, (ii) indicates that the carbon atom to which R_(3a) is attached is in the S-configuration, and (iii) indicates that the carbon atom to which R_(3a) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. † (iv) Indicates that the carbon atom to which R_(3b) is attached is in the (R)-configuration, (v) indicates that the carbon atom to which R_(3b) is attached is in the (S)-configuration, and (vi) indicates that the carbon atom to which R_(3b) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. ‡ (vii) Indicates that the carbon atom to which R_(3c) is attached is in the (R)-configuration, (viii) indicates that the carbon atom to which R_(3c) is attached is in the (S)-configuration, and (ix) indicates that the carbon atom to which R_(3c) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations.

TABLE 9

(a)

(b) and pharmaceutically acceptable derivatives thereof, where:

Compound R_(3a) * R_(3b) † R_(3c) ‡ R₈′ H1 a or b —H —H —H —H H2 a or b —C(O)OH —H —H —H H3 a or b —H —C(O)OH —H —H H4 a or b —CH₃ —H —H —H H5 a or b —H —CH₃ —H —H H6 a or b —CH₃ —CH₃ —H —H H7 a or b —C(O)OH —CH₃ —H —H H8 a or b —C(O)OH —H —CH₃ —H H9 a or b —CH₃ —C(O)OH —H —H H10 a or b —H —H —H —CH₃ H11 a or b —C(O)OH —H —H —CH₃ H12 a or b —H —C(O)OH —H —CH₃ H13 a or b —CH₃ —H —H —CH₃ H14 a or b —H —CH₃ —H —CH₃ H15 a or b —CH₃ —CH₃ —H —CH₃ H16 a or b —C(O)OH —CH₃ —H —CH₃ H17 a or b —C(O)OH —H —CH₃ —CH₃ H18 a or b —CH₃ —C(O)OH —H —CH₃ H19 a or b —H —H —H —CH₂CH₃ H20 a or b —C(O)OH —H —H —CH₂CH₃ H21 a or b —H —C(O)OH —H —CH₂CH₃ H22 a or b —CH₃ —H —H —CH₂CH₃ H23 a or b —H —CH₃ —H —CH₂CH₃ H24 a or b —CH₃ —CH₃ —H —CH₂CH₃ H25 a or b —C(O)OH —CH₃ —H —CH₂CH₃ H26 a or b —C(O)OH —H —CH₃ —CH₂CH₃ H27 a or b —CH₃ —C(O)OH —H —CH₂CH₃ H28 a or b —CH₂C(O)OH —H —H —H H29 a or b —H —CH₂C(O)OH —H —H H30 a or b —CH₂C(O)OH —CH₃ —H —H H31 a or b —CH₂C(O)OH —H —CH₃ —H H32 a or b —CH₃ —CH₂C(O)OH —H —H H33 a or b —CH₂C(O)OH —H —H —CH₃ H34 a or b —H —CH₂C(O)OH —H —CH₃ H35 a or b —CH₂C(O)OH —CH₃ —H —CH₃ H36 a or b —CH₂C(O)OH —H —CH₃ —CH₃ H37 a or b —CH₃ —CH₂C(O)OH —H —CH₃ H38 a or b —CH₂C(O)OH —H —H —CH₂CH₃ H39 a or b —H —CH₂C(O)OH —H —CH₂CH₃ H40 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ H41 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ H42 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ H43 a or b —H —NH₂ —H —H H44 a or b —H —N(H)CH₃ —H —H H45 a or b —H —N(CH₃)₂ —H —H H46 a or b —H —NHC(O)CH₃ —H —H H47 a or b —H —OCH₃ —H —H H48 a or b —H —NH₂ —H —CH₃ H49 a or b —H —N(H)CH₃ —H —CH₃ H50 a or b —H —N(CH₃)₂ —H —CH₃ H51 a or b —H —NHC(O)CH₃ —H —CH₃ H52 a or b —H —OCH₃ —H —CH₃ H53 a or b —H —NH₂ —H —CH₂CH₃ H54 a or b —H —N(H)CH₃ —H —CH₂CH₃ H55 a or b —H —N(CH₃)₂ —H —CH₂CH₃ H56 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ H57 a or b —H —OCH₃ —H —CH₂CH₃ H58 a or b —H —NH₂ —CH₃ —H H59 a or b —H —N(H)CH₃ —CH₃ —H H60 a or b —H —N(CH₃)₂ —CH₃ —H H61 a or b —H —NHC(O)CH₃ —CH₃ —H H62 a or b —H —OCH₃ —CH₃ —H H63 a or b —H —NH₂ —CH₃ —CH₃ H64 a or b —H —N(H)CH₃ —CH₃ —CH₃ H65 a or b —H —N(CH₃)₂ —CH₃ —CH₃ H66 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ H67 a or b —H —OCH₃ —CH₃ —CH₃ H68 a or b —H —NH₂ —CH₃ —CH₂CH₃ H69 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ H70 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ H71 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ H72 a or b —H —OCH₃ —CH₃ —CH₂CH₃ H73 a or b —CH₃ —NH₂ —H —H H74 a or b —CH₃ —N(H)CH₃ —H —H H75 a or b —CH₃ —N(CH₃)₂ —H —H H76 a or b —CH₃ —NHC(O)CH₃ —H —H H77 a or b —CH₃ —OCH₃ —H —H H78 a or b —CH₃ —NH₂ —H —CH₃ H79 a or b —CH₃ —N(H)CH₃ —H —CH₃ H80 a or b —CH₃ —N(CH₃)₂ —H —CH₃ H81 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ H82 a or b —CH₃ —OCH₃ —H —CH₃ H83 a or b —CH₃ —NH₂ —H —CH₂CH₃ H84 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ H85 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ H86 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ H87 a or b —CH₃ —OCH₃ —H —CH₂CH₃ H88 a or b —CH₃ —NH₂ —CH₃ —H H89 a or b —CH₃ —N(H)CH₃ —CH₃ —H H90 a or b —CH₃ —N(CH₃)₂ —CH₃ —H H91 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H H92 a or b —CH₃ —OCH₃ —CH₃ —H H93 a or b —CH₃ —NH₂ —CH₃ —CH₃ H94 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ H95 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ H96 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ H97 a or b —CH₃ —OCH₃ —CH₃ —CH₃ H98 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ H99 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ H100 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ H101 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ H102 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ H103 a or b —C(O)OH —NH₂ —H —H H104 a or b —C(O)OH —N(H)CH₃ —H —H H105 a or b —C(O)OH —N(CH₃)₂ —H —H H106 a or b —C(O)OH —NHC(O)CH₃ —H —H H107 a or b —C(O)OH —OCH₃ —H —H H108 a or b —C(O)OH —NH₂ —H —CH₃ H109 a or b —C(O)OH —N(H)CH₃ —H —CH₃ H110 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ H111 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ H112 a or b —C(O)OH —OCH₃ —H —CH₃ H113 a or b —C(O)OH —NH₂ —H —CH₂CH₃ H114 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ H115 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ H116 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ H117 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ H118 a or b —C(O)OH —NH₂ —CH₃ —H H119 a or b —C(O)OH —N(H)CH₃ —CH₃ —H H120 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H H121 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H H122 a or b —C(O)OH —OCH₃ —CH₃ —H H123 a or b —C(O)OH —NH₂ —CH₃ —CH₃ H124 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ H125 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ H126 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ H127 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ H128 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ H129 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ H130 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ H131 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ H132 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ H133 a or b —CH₂C(O)OH —NH₂ —H —H H134 a or b —CH₂C(O)OH —N(H)CH₃ —H —H H135 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H H136 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H H137 a or b —CH₂C(O)OH —OCH₃ —H —H H138 a or b —CH₂C(O)OH —NH₂ —H —CH₃ H139 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ H140 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ H141 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ H142 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ H143 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ H144 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ H145 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ H146 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ H147 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ H148 a or b —CH₂C(O)OH —NH₂ —CH₃ —H H149 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H H150 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H H151 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H H152 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H H153 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ H154 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ H155 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ H156 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ H157 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ H158 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ H159 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ H160 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ H161 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ H162 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ * (i) Indicates that the carbon atom to which R_(3a) is attached is in the (R)-configuration, (ii) indicates that the carbon atom to which R_(3a) is attached is in the S-configuration, and (iii) indicates that the carbon atom to which R_(3a) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. † (iv) Indicates that the carbon atom to which R_(3b) is attached is in the (R)-configuration, (v) indicates that the carbon atom to which R_(3b) is attached is in the (S)-configuration, and (vi) indicates that the carbon atom to which R_(3b) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations. ‡ (vii) Indicates that the carbon atom to which R_(3c) is attached is in the (R)-configuration, (viii) indicates that the carbon atom to which R_(3c) is attached is in the (S)-configuration, and (ix) indicates that the carbon atom to which R_(3c) is attached contains an equal mixture (i.e., 50%/50%) of the (R)- and (S)-configurations.

TABLE 10

(a)

(b) and pharmaceutically acceptable derivatives thereof, where:

Compound R_(3a) * R_(3b) † R_(3c) ‡ R₈′ J1 a or b —H —H —H —H J2 a or b —C(O)OH —H —H —H J3 a or b —H —C(O)OH —H —H J4 a or b —CH₃ —H —H —H J5 a or b —H —CH₃ —H —H J6 a or b —CH₃ —CH₃ —H —H J7 a or b —C(O)OH —CH₃ —H —H J8 a or b —C(O)OH —H —CH₃ —H J9 a or b —CH₃ —C(O)OH —H —H J10 a or b —H —H —H —CH₃ J11 a or b —C(O)OH —H —H —CH₃ J12 a or b —H —C(O)OH —H —CH₃ J13 a or b —CH₃ —H —H —CH₃ J14 a or b —H —CH₃ —H —CH₃ J15 a or b —CH₃ —CH₃ —H —CH₃ J16 a or b —C(O)OH —CH₃ —H —CH₃ J17 a or b —C(O)OH —H —CH₃ —CH₃ J18 a or b —CH₃ —C(O)OH —H —CH₃ J19 a or b —H —H —H —CH₂CH₃ J20 a or b —C(O)OH —H —H —CH₂CH₃ J21 a or b —H —C(O)OH —H —CH₂CH₃ J22 a or b —CH₃ —H —H —CH₂CH₃ J23 a or b —H —CH₃ —H —CH₂CH₃ J24 a or h —CH₃ —CH₃ —H —CH₂CH₃ J25 a or b —C(O)OH —CH₃ —H —CH₂CH₃ J26 a or b —C(O)OH —H —CH₃ —CH₂CH₃ J27 a or b —CH₃ —C(O)OH —H —CH₂CH₃ J28 a or b —CH₂C(O)OH —H —H —H J29 a or b —H —CH₂C(O)OH —H —H J30 a or b —CH₂C(O)OH —CH₃ —H —H J31 a or b —CH₂C(O)OH —H —CH₃ —H J32 a or b —CH₃ —CH₂C(O)OH —H —H J33 a or b —CH₂C(O)OH —H —H —CH₃ J34 a or b —H —CH₂C(O)OH —H —CH₃ J35 a or b —CH₂C(O)OH —CH₃ —H —CH₃ J36 a or b —CH₂C(O)OH —H —CH₃ —CH₃ J37 a or b —CH₃ —CH₂C(O)OH —H —CH₃ J38 a or b —CH₂C(O)OH —H —H —CH₂CH₃ J39 a or b —H —CH₂C(O)OH —H —CH₂CH₃ J40 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ J41 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ J42 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ J43 a or b —H —NH₂ —H —H J44 a or b —H —N(H)CH₃ —H —H J45 a or b —H —N(CH₃)₂ —H —H J46 a or b —H —NHC(O)CH₃ —H —H J47 a or b —H —OCH₃ —H —H J48 a or b —H —NH₂ —H —CH₃ J49 a or b —H —N(H)CH₃ —H —CH₃ J50 a or b —H —N(CH₃)₂ —H —CH₃ J51 a or b —H —NHC(O)CH₃ —H —CH₃ J52 a or b —H —OCH₃ —H —CH₃ J53 a or b —H —NH₂ —H —CH₂CH₃ J54 a or b —H —N(H)CH₃ —H —CH₂CH₃ J55 a or b —H —N(CH₃)₂ —H —CH₂CH₃ J56 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ J57 a or b —H —OCH₃ —H —CH₂CH₃ J58 a or b —H —NH₂ —CH₃ —H J59 a or b —H —N(H)CH₃ —CH₃ —H J60 a or b —H —N(CH₃)₂ —CH₃ —H J61 a or b —H —NHC(O)CH₃ —CH₃ —H J62 a or b —H —OCH₃ —CH₃ —H J63 a or b —H —NH₂ —CH₃ —CH₃ J64 a or b —H —N(H)CH₃ —CH₃ —CH₃ J65 a or b —H —N(CH₃)₂ —CH₃ —CH₃ J66 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ J67 a or b —H —OCH₃ —CH₃ —CH₃ J68 a or b —H —NH₂ —CH₃ —CH₂CH₃ J69 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ J70 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ J71 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ J72 a or b —H —OCH₃ —CH₃ —CH₂CH₃ J73 a or b —CH₃ —NH₂ —H —H J74 a or b —CH₃ —N(H)CH₃ —H —H J75 a or b —CH₃ —N(CH₃)₂ —H —H J76 a or b —CH₃ —NHC(O)CH₃ —H —H J77 a or b —CH₃ —OCH₃ —H —H J78 a or b —CH₃ —NH₂ —H —CH₃ J79 a or b —CH₃ —N(H)CH₃ —H —CH₃ J80 a or b —CH₃ —N(CH₃)₂ —H —CH₃ J81 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ J82 a or b —CH₃ —OCH₃ —H —CH₃ J83 a or b —CH₃ —NH₂ —H —CH₂CH₃ J84 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ J85 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ J86 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ J87 a or b —CH₃ —OCH₃ —H —CH₂CH₃ J88 a or b —CH₃ —NH₂ —CH₃ —H J89 a or b —CH₃ —N(H)CH₃ —CH₃ —H J90 a or b —CH₃ —N(CH₃)₂ —CH₃ —H J91 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H J92 a or b —CH₃ —OCH₃ —CH₃ —H J93 a or b —CH₃ —NH₂ —CH₃ —CH₃ J94 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ J95 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ J96 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ J97 a or b —CH₃ —OCH₃ —CH₃ —CH₃ J98 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ J99 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ J100 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ J101 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ J102 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ J103 a or b —C(O)OH —NH₂ —H —H J104 a or b —C(O)OH —N(H)CH₃ —H —H J105 a or b —C(O)OH —N(CH₃)₂ —H —H J106 a or b —C(O)OH —NHC(O)CH₃ —H —H J107 a or b —C(O)OH —OCH₃ —H —H J108 a or b —C(O)OH —NH₂ —H —CH₃ J109 a or b —C(O)OH —N(H)CH₃ —H —CH₃ J110 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ J111 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ J112 a or b —C(O)OH —OCH₃ —H —CH₃ J113 a or b —C(O)OH —NH₂ —H —CH₂CH₃ J114 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ J115 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ J116 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ J117 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ J118 a or b —C(O)OH —NH₂ —CH₃ —H J119 a or b —C(O)OH —N(H)CH₃ —CH₃ —H J120 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H J121 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H J122 a or b —C(O)OH —OCH₃ —CH₃ —H J123 a or b —C(O)OH —NH₂ —CH₃ —CH₃ J124 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ J125 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ J126 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ J127 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ J128 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ J129 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ J130 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ J131 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ J132 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ J133 a or b —CH₂C(O)OH —NH₂ —H —H J134 a or b —CH₂C(O)OH —N(H)CH₃ —H —H J135 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H J136 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H J137 a or b —CH₂C(O)OH —OCH₃ —H —H J138 a or b —CH₂C(O)OH —NH₂ —H —CH₃ J139 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ J140 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ J141 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ J142 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ J143 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ J144 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ J145 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ J146 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ J147 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ J148 a or b —CH₂C(O)OH —NH₂ —CH₃ —H J149 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H J150 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H J151 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H J152 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H J153 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ J154 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ J155 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ J156 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ J157 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ J158 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ J159 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ J160 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ J161 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ J162 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ * (i) Indicates that the carbon atom to which R_(3a) is attached is in the (R)- configuration, (ii) indicates that the carbon atom to which R_(3a) is attached is in the S- configuration, and (iii) indicates that the carbon atom to which R_(3a) is attached contains an equal mixture (i.e. , 50%/50%) of the (R)- and (S)- configurations. † (iv) Indicates that the carbon atom to which R_(3b) is attached is in the (R)- configuration, (v) indicates that the carbon atom to which R_(3b) is attached is in the (S)- configuration, and (vi) indicates that the carbon atom to which R_(3b) is attached contains an equal mixture (i.e. , 50%/50%) of the (R)- and (S)- configurations. ‡ (vii) Indicates that the carbon atom to which R_(3c) is attached is in the (R)- configuration, (viii) indicates that the carbon atom to which R_(3c) is attached is in the (S)- configuration, and (ix) indicates that the carbon atom to which R_(3c) is attached contains an equal mixture (i.e. , 50%/50%) of the (R)- and (S)- configurations.

TABLE 11

(a)

(b) and pharmaceutically acceptable derivatives thereof, where:

Compound R_(3a) * R_(3b) † R_(3c) ‡ R₈′ K1 a or b —H —H —H —H K2 a or b —C(O)OH —H —H —H K3 a or b —H —C(O)OH —H —H K4 a or b —CH₃ —H —H —H K5 a or b —H —CH₃ —H —H K6 a or b —CH₃ —CH₃ —H —H K7 a or b —C(O)OH —CH₃ —H —H K8 a or b —C(O)OH —H —CH₃ —H K9 a or b —CH₃ —C(O)OH —H —H K10 a or b —H —H —H —CH₃ K11 a or b —C(O)OH —H —H —CH₃ K12 a or b —H —C(O)OH —H —CH₃ K13 a or b —CH₃ —H —H —CH₃ K14 a or b —H —CH₃ —H —CH₃ K15 a or b —CH₃ —CH₃ —H —CH₃ K16 a or b —C(O)OH —CH₃ —H —CH₃ K17 a or b —C(O)OH —H —CH₃ —CH₃ K18 a or b —CH₃ —C(O)OH —H —CH₃ K19 a or b —H —H —H —CH₂CH₃ K20 a or b —C(O)OH —H —H —CH₂CH₃ K21 a or b —H —C(O)OH —H —CH₂CH₃ K22 a or b —CH₃ —H —H —CH₂CH₃ K23 a or b —H —CH₃ —H —CH₂CH₃ K24 a or b —CH₃ —CH₃ —H —CH₂CH₃ K25 a or b —C(O)OH —CH₃ —H —CH₂CH₃ K26 a or b —C(O)OH —H —CH₃ —CH₂CH₃ K27 a or b —CH₃ —C(O)OH —H —CH₂CH₃ K28 a or b —CH₂C(O)OH —H —H —H K29 a or b —H —CH₂C(O)OH —H —H K30 a or b —CH₂C(O)OH —CH₃ —H —H K31 a or b —CH₂C(O)OH —H —CH₃ —H K32 a or b —CH₃ —CH₂C(O)OH —H —H K33 a or b —CH₂C(O)OH —H —H —CH₃ K34 a or b —H —CH₂C(O)OH —H —CH₃ K35 a or b —CH₂C(O)OH —CH₃ —H —CH₃ K36 a or b —CH₂C(O)OH —H —CH₃ —CH₃ K37 a or b —CH₃ —CH₂C(O)OH —H —CH₃ K38 a or b —CH₂C(O)OH —H —H —CH₂CH₃ K39 a or b —H —CH₂C(O)OH —H —CH₂CH₃ K40 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ K41 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ K42 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ K43 a or b —H —NH₂ —H —H K44 a or b —H —N(H)CH₃ —H —H K45 a or b —H —N(CH₃)₂ —H —H K46 a or b —H —NHC(O)CH₃ —H —H K47 a or b —H —OCH₃ —H —H K48 a or b —H —NH₂ —H —CH₃ K49 a or b —H —N(H)CH₃ —H —CH₃ K50 a or b —H —N(CH₃)₂ —H —CH₃ K51 a or b —H —NHC(O)CH₃ —H —CH₃ K52 a or b —H —OCH₃ —H —CH₃ K53 a or b —H —NH₂ —H —CH₂CH₃ K54 a or b —H —N(H)CH₃ —H —CH₂CH₃ K55 a or b —H —N(CH₃)₂ —H —CH₂CH₃ K56 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ K57 a or b —H —OCH₃ —H —CH₂CH₃ K58 a or b —H —NH₂ —CH₃ —H K59 a or b —H —N(H)CH₃ —CH₃ —H K60 a or b —H —N(CH₃)₂ —CH₃ —H K61 a or b —H —NHC(O)CH₃ —CH₃ —H K62 a or b —H —OCH₃ —CH₃ —H K63 a or b —H —NH₂ —CH₃ —CH₃ K64 a or b —H —N(H)CH₃ —CH₃ —CH₃ K65 a or b —H —N(CH₃)₂ —CH₃ —CH₃ K66 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ K67 a or b —H —OCH₃ —CH₃ —CH₃ K68 a or b —H —NH₂ —CH₃ —CH₂CH₃ K69 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ K70 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ K71 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ K72 a or b —H —OCH₃ —CH₃ —CH₂CH₃ K73 a or b —CH₃ —NH₂ —H —H K74 a or b —CH₃ —N(H)CH₃ —H —H K75 a or b —CH₃ —N(CH₃)₂ —H —H K76 a or b —CH₃ —NHC(O)CH₃ —H —H K77 a or b —CH₃ —OCH₃ —H —H K78 a or b —CH₃ —NH₂ —H —CH₃ K79 a or b —CH₃ —N(H)CH₃ —H —CH₃ K80 a or b —CH₃ —N(CH₃)₂ —H —CH₃ K81 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ K82 a or b —CH₃ —OCH₃ —H —CH₃ K83 a or b —CH₃ —NH₂ —H —CH₂CH₃ K84 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ K85 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ K86 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ K87 a or b —CH₃ —OCH₃ —H —CH₂CH₃ K88 a or b —CH₃ —NH₂ —CH₃ —H K89 a or b —CH₃ —N(H)CH₃ —CH₃ —H K90 a or b —CH₃ —N(CH₃)₂ —CH₃ —H K91 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H K92 a or b —CH₃ —OCH₃ —CH₃ —H K93 a or b —CH₃ —NH₂ —CH₃ —CH₃ K94 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ K95 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ K96 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ K97 a or b —CH₃ —OCH₃ —CH₃ —CH₃ K98 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ K99 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ K100 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ K101 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ K102 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ K103 a or b —C(O)OH —NH₂ —H —H K104 a or b —C(O)OH —N(H)CH₃ —H —H K105 a or b —C(O)OH —N(CH₃)₂ —H —H K106 a or b —C(O)OH —NHC(O)CH₃ —H —H K107 a or b —C(O)OH —OCH₃ —H —H K108 a or b —C(O)OH —NH₂ —H —CH₃ K109 a or b —C(O)OH —N(H)CH₃ —H —CH₃ K110 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ K111 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ K112 a or b —C(O)OH —OCH₃ —H —CH₃ K113 a or b —C(O)OH —NH₂ —H —CH₂CH₃ K114 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ K115 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ K116 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ K117 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ K118 a or b —C(O)OH —NH₂ —CH₃ —H K119 a or b —C(O)OH —N(H)CH₃ —CH₃ —H K120 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H K121 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H K122 a or b —C(O)OH —OCH₃ —CH₃ —H K123 a or b —C(O)OH —NH₂ —CH₃ —CH₃ K124 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ K125 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ K126 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ K127 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ K128 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ K129 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ K130 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ K131 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ K132 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ K133 a or b —CH₂C(O)OH —NH₂ —H —H K134 a or b —CH₂C(O)OH —N(H)CH₃ —H —H K135 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H K136 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H K137 a or b —CH₂C(O)OH —OCH₃ —H —H K138 a or b —CH₂C(O)OH —NH₂ —H —CH₃ K139 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ K140 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ K141 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ K142 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ K143 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ K144 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ K145 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ K146 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ K147 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ K148 a or b —CH₂C(O)OH —NH₂ —CH₃ —H K149 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H K150 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H K151 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H K152 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H K153 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ K154 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ K155 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ K156 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ K157 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ K158 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ K159 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ K160 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ K161 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ K162 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ * (i) Indicates that the carbon atom to which R_(3a) is attached is in the (R)- configuration, (ii) indicates that the carbon atom to which R_(3a) is attached is in the S- configuration, and (iii) indicates that the carbon atom to which R_(3a) is attached contains an equal mixture (i.e. , 50%/50%) of the (R)- and (S)- configurations. † (iv) Indicates that the carbon atom to which R_(3b) is attached is in the (R)- configuration, (v) indicates that the carbon atom to which R_(3b) is attached is in the (S)- configuration, and (vi) indicates that the carbon atom to which R_(3b) is attached contains an equal mixture (i.e. , 50%/50%) of the (R)- and (S)- configurations. ‡ (vii) Indicates that the carbon atom to which R_(3c) is attached is in the (R)- configuration, (viii) indicates that the carbon atom to which R_(3c) is attached is in the (S)- configuration, and (ix) indicates that the carbon atom to which R_(3c) is attached contains an equal mixture (i.e. , 50%/50%) of the (R)- and (S)- configurations.

TABLE 12

(a)

(b) and pharmaceutically acceptable derivatives thereof, where:

Compound R_(3a) * R_(3b) † R_(3c) ‡ R₈′ L1 a or b —H —H —H —H L2 a or b —C(O)OH —H —H —H L3 a or b —H —C(O)OH —H —H L4 a or b —CH₃ —H —H —H L5 a or b —H —CH₃ —H —H L6 a or b —CH₃ —CH₃ —H —H L7 a or b —C(O)OH —CH₃ —H —H L8 a or b —C(O)OH —H —CH₃ —H L9 a or b —CH₃ —C(O)OH —H —H L10 a or b —H —H —H —CH₃ L11 a or b —C(O)OH —H —H —CH₃ L12 a or b —H —C(O)OH —H —CH₃ L13 a or b —CH₃ —H —H —CH₃ L14 a or b —H —CH₃ —H —CH₃ L15 a or b —CH₃ —CH₃ —H —CH₃ L16 a or b —C(O)OH —CH₃ —H —CH₃ L17 a or b —C(O)OH —H —CH₃ —CH₃ L18 a or b —CH₃ —C(O)OH —H —CH₃ L19 a or b —H —H —H —CH₂CH₃ L20 a or b —C(O)OH —H —H —CH₂CH₃ L21 a or b —H —C(O)OH —H —CH₂CH₃ L22 a or b —CH₃ —H —H —CH₂CH₃ L23 a or b —H —CH₃ —H —CH₂CH₃ L24 a or b —CH₃ —CH₃ —H —CH₂CH₃ L25 a or b —C(O)OH —CH₃ —H —CH₂CH₃ L26 a or b —C(O)OH —H —CH₃ —CH₂CH₃ L27 a or b —CH₃ —C(O)OH —H —CH₂CH₃ L28 a or b —CH₂C(O)OH —H —H —H L29 a or b —H —CH₂C(O)OH —H —H L30 a or b —CH₂C(O)OH —CH₃ —H —H L31 a or b —CH₂C(O)OH —H —CH₃ —H L32 a or b —CH₃ —CH₂C(O)OH —H —H L33 a or b —CH₂C(O)OH —H —H —CH₃ L34 a or b —H —CH₂C(O)OH —H —CH₃ L35 a or b —CH₂C(O)OH —CH₃ —H —CH₃ L36 a or b —CH₂C(O)OH —H —CH₃ —CH₃ L37 a or b —CH₃ —CH₂C(O)OH —H —CH₃ L38 a or b —CH₂C(O)OH —H —H —CH₂CH₃ L39 a or b —H —CH₂C(O)OH —H —CH₂CH₃ L40 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ L41 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ L42 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ L43 a or b —H —NH₂ —H —H L44 a or b —H —N(H)CH₃ —H —H L45 a or b —H —N(CH₃)₂ —H —H L46 a or b —H —NHC(O)CH₃ —H —H L47 a or b —H —OCH₃ —H —H L48 a or b —H —NH₂ —H —CH₃ L49 a or b —H —N(H)CH₃ —H —CH₃ L50 a or b —H —N(CH₃)₂ —H —CH₃ L51 a or b —H —NHC(O)CH₃ —H —CH₃ L52 a or b —H —OCH₃ —H —CH₃ L53 a or b —H —NH₂ —H —CH₂CH₃ L54 a or b —H —N(H)CH₃ —H —CH₂CH₃ L55 a or b —H —N(CH₃)₂ —H —CH₂CH₃ L56 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ L57 a or b —H —OCH₃ —H —CH₂CH₃ L58 a or b —H —NH₂ —CH₃ —H L59 a or b —H —N(H)CH₃ —CH₃ —H L60 a or b —H —N(CH₃)₂ —CH₃ —H L61 a or b —H —NHC(O)CH₃ —CH₃ —H L62 a or b —H —OCH₃ —CH₃ —H L63 a or b —H —NH₂ —CH₃ —CH₃ L64 a or b —H —N(H)CH₃ —CH₃ —CH₃ L65 a or b —H —N(CH₃)₂ —CH₃ —CH₃ L66 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ L67 a or b —H —OCH₃ —CH₃ —CH₃ L68 a or b —H —NH₂ —CH₃ —CH₂CH₃ L69 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ L70 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ L71 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ L72 a or b —H —OCH₃ —CH₃ —CH₂CH₃ L73 a or b —CH₃ —NH₂ —H —H L74 a or b —CH₃ —N(H)CH₃ —H —H L75 a or b —CH₃ —N(CH₃)₂ —H —H L76 a or b —CH₃ —NHC(O)CH₃ —H —H L77 a or b —CH₃ —OCH₃ —H —H L78 a or b —CH₃ —NH₂ —H —CH₃ L79 a or b —CH₃ —N(H)CH₃ —H —CH₃ L80 a or b —CH₃ —N(CH₃)₂ —H —CH₃ L81 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ L82 a or b —CH₃ —OCH₃ —H —CH₃ L83 a or b —CH₃ —NH₂ —H —CH₂CH₃ L84 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ L85 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ L86 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ L87 a or b —CH₃ —OCH₃ —H —CH₂CH₃ L88 a or b —CH₃ —NH₂ —CH₃ —H L89 a or b —CH₃ —N(H)CH₃ —CH₃ —H L90 a or b —CH₃ —N(CH₃)₂ —CH₃ —H L91 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H L92 a or b —CH₃ —OCH₃ —CH₃ —H L93 a or b —CH₃ —NH₂ —CH₃ —CH₃ L94 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ L95 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ L96 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ L97 a or b —CH₃ —OCH₃ —CH₃ —CH₃ L98 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ L99 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ L100 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ L101 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ L102 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ L103 a or b —C(O)OH —NH₂ —H —H L104 a or b —C(O)OH —N(H)CH₃ —H —H L105 a or b —C(O)OH —N(CH₃)₂ —H —H L106 a or b —C(O)OH —NHC(O)CH₃ —H —H L107 a or b —C(O)OH —OCH₃ —H —H L108 a or b —C(O)OH —NH₂ —H —CH₃ L109 a or b —C(O)OH —N(H)CH₃ —H —CH₃ L110 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ L111 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ L112 a or b —C(O)OH —OCH₃ —H —CH₃ L113 a or b —C(O)OH —NH₂ —H —CH₂CH₃ L114 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ L115 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ L116 a orb —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ L117 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ L118 a or b —C(O)OH —NH₂ —CH₃ —H L119 a or b —C(O)OH —N(H)CH₃ —CH₃ —H L120 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H L121 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H L122 a or b —C(O)OH —OCH₃ —CH₃ —H L123 a or b —C(O)OH —NH₂ —CH₃ —CH₃ L124 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ L125 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ L126 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ L127 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ L128 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ L129 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ L130 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ L131 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ L132 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ L133 a or b —CH₂C(O)OH —NH₂ —H —H L134 a or b —CH₂C(O)OH —N(H)CH₃ —H —H L135 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H L136 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H L137 a or b —CH₂C(O)OH —OCH₃ —H —H L138 a or b —CH₂C(O)OH —NH₂ —H —CH₃ L139 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ L140 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ L141 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ L142 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ L143 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ L144 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ L145 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ L146 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ L147 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ L148 a or b —CH₂C(O)OH —NH₂ —CH₃ —H L149 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H L150 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H L151 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H L152 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H L153 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ L154 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ L155 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ L156 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ L157 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ L158 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ L159 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ L160 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ L161 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ L162 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ * (i) Indicates that the carbon atom to which R_(3a) is attached is in the (R)- configuration, (ii) indicates that the carbon atom to which R_(3a) is attached is in the S- configuration, and (iii) indicates that the carbon atom to which R_(3a) is attached contains an equal mixture (i.e. , 50%/50%) of the (R)- and (S)- configurations. † (iv) Indicates that the carbon atom to which R_(3b) is attached is in the (R)- configuration, (v) indicates that the carbon atom to which R_(3b) is attached is in the (S)- configuration, and (vi) indicates that the carbon atom to which R_(3b) is attached contains an equal mixture (i.e. , 50%/50%) of the (R)- and (S)- configurations. ‡ (vii) Indicates that the carbon atom to which R_(3c) is attached is in the (R)- configuration, (viii) indicates that the carbon atom to which R_(3c), is attached is in the (S)- configuration, and (ix) indicates that the carbon atom to which R_(3c) is attached contains an equal mixture (i.e. , 50%/50%) of the (R)- and (S)- configurations.

TABLE 13

(a)

(b) and pharmaceutically acceptable derivatives thereof, where:

Compound R_(3a) * R_(3b) † R_(3c) ‡ R₈′ M1 a or b —H —H —H —H M2 a or b —C(O)OH —H —H —H M3 a or b —H —C(O)OH —H —H M4 a or b —CH₃ —H —H —H M5 a or b —H —CH₃ —H —H M6 a or b —CH₃ —CH₃ —H —H M7 a or b —C(O)OH —CH₃ —H —H M8 a or b —C(O)OH —H —CH₃ —H M9 a or b —CH₃ —C(O)OH —H —H M10 a or b —H —H —H —CH₃ M11 a or b —C(O)OH —H —H —CH₃ M12 a or b —H —C(O)OH —H —CH₃ M13 a or b —CH₃ —H —H —CH₃ M14 a or b —H —CH₃ —H —CH₃ M15 a or b —CH₃ —CH₃ —H —CH₃ M16 a or b —C(O)OH —CH₃ —H —CH₃ M17 a or b —C(O)OH —H —CH₃ —CH₃ M18 a or b —CH₃ —C(O)OH —H —CH₃ M19 a or b —H —H —H —CH₂CH₃ M20 a or b —C(O)OH —H —H —CH₂CH₃ M21 a or b —H —C(O)OH —H —CH₂CH₃ M22 a or b —CH₃ —H —H —CH₂CH₃ M23 a or b —H —CH₃ —H —CH₂CH₃ M24 a or b —CH₃ —CH₃ —H —CH₂CH₃ M25 a or b —C(O)OH —CH₃ —H —CH₂CH₃ M26 a or b —C(O)OH —H —CH₃ —CH₂CH₃ M27 a or b —CH₃ —C(O)OH —H —CH₂CH₃ M28 a or b —CH₂C(O)OH —H —H —H M29 a or b —H —CH₂C(O)OH —H —H M30 a or b —CH₂C(O)OH —CH₃ —H —H M31 a or b —CH₂C(O)OH —H —CH₃ —H M32 a or b —CH₃ —CH₂C(O)OH —H —H M33 a or b —CH₂C(O)OH —H —H —CH₃ M34 a or b —H —CH₂C(O)OH —H —CH₃ M35 a or b —CH₂C(O)OH —CH₃ —H —CH₃ M36 a or b —CH₂C(O)OH —H —CH₃ —CH₃ M37 a or b —CH₃ —CH₂C(O)OH —H —CH₃ M38 a or b —CH₂C(O)OH —H —H —CH₂CH₃ M39 a or b —H —CH₂C(O)OH —H —CH₂CH₃ M40 a or b —CH₂C(O)OH —CH₃ —H —CH₂CH₃ M41 a or b —CH₂C(O)OH —H —CH₃ —CH₂CH₃ M42 a or b —CH₃ —CH₂C(O)OH —H —CH₂CH₃ M43 a or b —H —NH₂ —H —H M44 a or b —H —N(H)CH₃ —H —H M45 a or b —H —N(CH₃)₂ —H —H M46 a or b —H —NHC(O)CH₃ —H —H M47 a or b —H —OCH₃ —H —H M48 a or b —H —NH₂ —H —CH₃ M49 a or b —H —N(H)CH₃ —H —CH₃ M50 a or b —H —N(CH₃)₂ —H —CH₃ M51 a or b —H —NHC(O)CH₃ —H —CH₃ M52 a or b —H —OCH₃ —H —CH₃ M53 a or b —H —NH₂ —H —CH₂CH₃ M54 a or b —H —N(H)CH₃ —H —CH₂CH₃ M55 a or b —H —N(CH₃)₂ —H —CH₂CH₃ M56 a or b —H —NHC(O)CH₃ —H —CH₂CH₃ M57 a or b —H —OCH₃ —H —CH₂CH₃ M58 a or b —H —NH₂ —CH₃ —H M59 a or b —H —N(H)CH₃ —CH₃ —H M60 a or b —H —N(CH₃)₂ —CH₃ —H M61 a or b —H —NHC(O)CH₃ —CH₃ —H M62 a or b —H —OCH₃ —CH₃ —H M63 a or b —H —NH₂ —CH₃ —CH₃ M64 a or b —H —N(H)CH₃ —CH₃ —CH₃ M65 a or b —H —N(CH₃)₂ —CH₃ —CH₃ M66 a or b —H —NHC(O)CH₃ —CH₃ —CH₃ M67 a or b —H —OCH₃ —CH₃ —CH₃ M68 a or b —H —NH₂ —CH₃ —CH₂CH₃ M69 a or b —H —N(H)CH₃ —CH₃ —CH₂CH₃ M70 a or b —H —N(CH₃)₂ —CH₃ —CH₂CH₃ M71 a or b —H —NHC(O)CH₃ —CH₃ —CH₂CH₃ M72 a or b —H —OCH₃ —CH₃ —CH₂CH₃ M73 a or b —CH₃ —NH₂ —H —H M74 a or b —CH₃ —N(H)CH₃ —H —H M75 a or b —CH₃ —N(CH₃)₂ —H —H M76 a or b —CH₃ —NHC(O)CH₃ —H —H M77 a or b —CH₃ —OCH₃ —H —H M78 a or b —CH₃ —NH₂ —H —CH₃ M79 a or b —CH₃ —N(H)CH₃ —H —CH₃ M80 a or b —CH₃ —N(CH₃)₂ —H —CH₃ M81 a or b —CH₃ —NHC(O)CH₃ —H —CH₃ M82 a or b —CH₃ —OCH₃ —H —CH₃ M83 a or b —CH₃ —NH₂ —H —CH₂CH₃ M84 a or b —CH₃ —N(H)CH₃ —H —CH₂CH₃ M85 a or b —CH₃ —N(CH₃)₂ —H —CH₂CH₃ M86 a or b —CH₃ —NHC(O)CH₃ —H —CH₂CH₃ M87 a or b —CH₃ —OCH₃ —H —CH₂CH₃ M88 a or b —CH₃ —NH₂ —CH₃ —H M89 a or b —CH₃ —N(H)CH₃ —CH₃ —H M90 a or b —CH₃ —N(CH₃)₂ —CH₃ —H M91 a or b —CH₃ —NHC(O)CH₃ —CH₃ —H M92 a or b —CH₃ —OCH₃ —CH₃ —H M93 a or b —CH₃ —NH₂ —CH₃ —CH₃ M94 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₃ M95 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₃ M96 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₃ M97 a or b —CH₃ —OCH₃ —CH₃ —CH₃ M98 a or b —CH₃ —NH₂ —CH₃ —CH₂CH₃ M99 a or b —CH₃ —N(H)CH₃ —CH₃ —CH₂CH₃ M100 a or b —CH₃ —N(CH₃)₂ —CH₃ —CH₂CH₃ M101 a or b —CH₃ —NHC(O)CH₃ —CH₃ —CH₂CH₃ M102 a or b —CH₃ —OCH₃ —CH₃ —CH₂CH₃ M103 a or b —C(O)OH —NH₂ —H —H M104 a or b —C(O)OH —N(H)CH₃ —H —H M105 a or b —C(O)OH —N(CH₃)₂ —H —H M106 a or b —C(O)OH —NHC(O)CH₃ —H —H M107 a or b —C(O)OH —OCH₃ —H —H M108 a or b —C(O)OH —NH₂ —H —CH₃ M109 a or b —C(O)OH —N(H)CH₃ —H —CH₃ M110 a or b —C(O)OH —N(CH₃)₂ —H —CH₃ M111 a or b —C(O)OH —NHC(O)CH₃ —H —CH₃ M112 a or b —C(O)OH —OCH₃ —H —CH₃ M113 a or b —C(O)OH —NH₂ —H —CH₂CH₃ M114 a or b —C(O)OH —N(H)CH₃ —H —CH₂CH₃ M115 a or b —C(O)OH —N(CH₃)₂ —H —CH₂CH₃ M116 a or b —C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ M117 a or b —C(O)OH —OCH₃ —H —CH₂CH₃ M118 a or b —C(O)OH —NH₂ —CH₃ —H M119 a or b —C(O)OH —N(H)CH₃ —CH₃ —H M120 a or b —C(O)OH —N(CH₃)₂ —CH₃ —H M121 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —H M122 a or b —C(O)OH —OCH₃ —CH₃ —H M123 a or b —C(O)OH —NH₂ —CH₃ —CH₃ M124 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₃ M125 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₃ M126 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ M127 a or b —C(O)OH —OCH₃ —CH₃ —CH₃ M128 a or b —C(O)OH —NH₂ —CH₃ —CH₂CH₃ M129 a or b —C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ M130 a or b —C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ M131 a or b —C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ M132 a or b —C(O)OH —OCH₃ —CH₃ —CH₂CH₃ M133 a or b —CH₂C(O)OH —NH₂ —H —H M134 a or b —CH₂C(O)OH —N(H)CH₃ —H —H M135 a or b —CH₂C(O)OH —N(CH₃)₂ —H —H M136 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —H M137 a or b —CH₂C(O)OH —OCH₃ —H —H M138 a or b —CH₂C(O)OH —NH₂ —H —CH₃ M139 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₃ M140 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₃ M141 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₃ M142 a or b —CH₂C(O)OH —OCH₃ —H —CH₃ M143 a or b —CH₂C(O)OH —NH₂ —H —CH₂CH₃ M144 a or b —CH₂C(O)OH —N(H)CH₃ —H —CH₂CH₃ M145 a or b —CH₂C(O)OH —N(CH₃)₂ —H —CH₂CH₃ M146 a or b —CH₂C(O)OH —NHC(O)CH₃ —H —CH₂CH₃ M147 a or b —CH₂C(O)OH —OCH₃ —H —CH₂CH₃ M148 a or b —CH₂C(O)OH —NH₂ —CH₃ —H M149 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —H M150 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —H M151 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —H M152 a or b —CH₂C(O)OH —OCH₃ —CH₃ —H M153 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₃ M154 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₃ M155 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₃ M156 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₃ M157 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₃ M158 a or b —CH₂C(O)OH —NH₂ —CH₃ —CH₂CH₃ M159 a or b —CH₂C(O)OH —N(H)CH₃ —CH₃ —CH₂CH₃ M160 a or b —CH₂C(O)OH —N(CH₃)₂ —CH₃ —CH₂CH₃ M161 a or b —CH₂C(O)OH —NHC(O)CH₃ —CH₃ —CH₂CH₃ M162 a or b —CH₂C(O)OH —OCH₃ —CH₃ —CH₂CH₃ * (i) Indicates that the carbon atom to which R_(3a) is attached is in the (R)- configuration, (ii) indicates that the carbon atom to which R_(3a) is attached is in the S- configuration, and (iii) indicates that the carbon atom to which R_(3a) is attached contains an equal mixture (i.e. , 50%/50%) of the (R)- and (S)- configurations. † (iv) Indicates that the carbon atom to which R_(3b) is attached is in the (R)- configuration, (v) indicates that the carbon atom to which R_(3b) is attached is in the (S)- configuration, and (vi) indicates that the carbon atom to which R_(3b) is attached contains an equal mixture (i.e. , 50%/50%) of the (R)- and (S)- configurations. ‡ (vii) Indicates that the carbon atom to which R_(3c) is attached is in the (R)- configuration, (viii) indicates that the carbon atom to which R_(3c) is attached is in the (S)- configuration, and (ix) indicates that the carbon atom to which R_(3c) is attached contains an equal mixture (i.e. , 50%/50%) of the (R)- and (S)- configurations.

4.2 DEFINITIONS

As used in connection with the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds herein, the terms used herein having following meaning:

“—(C₁-C₁₀)alkyl” means a straight chain or branched non-cyclic hydrocarbon having 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 carbon atoms. Representative straight chain —(C₁-C₁₀)alkyls include -methyl, -ethyl, -n-propyl, -n-butyl, -n-pentyl, -n-hexyl, -n-heptyl, -n-octyl, -n-nonyl, and -n-decyl. A branched alkyl means that one or more straight chain —(C₁-C₈)alkyl groups, such as methyl, ethyl or propyl, replace one or both hydrogens in a —CH₂— group of a straight chain alkyl. A branched non-cyclic hydrocarbon means that one or more straight chain —(C₁-C₁₀)alkyl groups, such as methyl, ethyl or propyl, replace one or both hydrogens in a —CH₂— group of a straight chain non-cyclic hydrocarbon. Representative branched —(C₁-C₁₀)alkyls include -iso-propyl, -sec-butyl, -iso-butyl, -tert-butyl, -iso-pentyl, -neopentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl, 1-methylpentyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 1-ethylbutyl, 2-ethylbutyl, 3-ethylbutyl, 1,1-dimethylbutyl, 1,2-dimethylbutyl, 1,3-dimethylbutyl, 2,2-dimethylbutyl, 2,3-dimethylbutyl, 3,3-dimethylbutyl, 1-methylhexyl, 2-methylhexyl, 3-methylhexyl, 4-methylhexyl, 5-methylhexyl, 1,2-dimethylpentyl, 1,3-dimethylpentyl, 1,2-dimethylhexyl, 1,3-dimethylhexyl, 3,3-dimethylhexyl, 1,2-dimethylheptyl, 1,3-dimethylheptyl, and 3,3-dimethylheptyl.

In connection with the Z group, “—(C₁-C₁₀)alkyl-” means a straight chain or branched non-cyclic hydrocarbon moiety having 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 carbon atoms where two hydrogen atoms on the same or a different carbon atom of the moiety are each figuratively removed and replaced by a bond to one of the two adjoining groups. Representative —(C₁-C₁₀)alkyl- moieties include meth-1,1-diyl, eth-1,1-diyl, eth-1,2-diyl, n-prop-1,1-diyl, n-prop-1,2-diyl, n-prop-1,3-diyl, n-but-1,1-diyl, n-but-1,2-diyl, n-but-1,3-diyl, n-but-1,4-diyl, iso-but-1,1-diyl, iso-but-1,2-diyl, iso-but-1,3-diyl, n-deca-1,1-diyl, n-deca-1,2-diyl, n-deca-1,3-diyl, n-deca-1,4-diyl, n-deca-1,5-diyl, n-deca-1,6-diyl, n-deca-1,7-diyl, n-deca-1,8-diyl, n-deca-1,9-diyl, n-deca-1,10-diyl, and the like.

“—(C₁-C₆)alkyl” means a straight chain or branched non-cyclic hydrocarbon having 1, 2, 3, 4, 5, or 6 carbon atoms. Representative straight chain —(C₁-C₆)alkyls include -methyl, -ethyl, -n-propyl, -n-butyl, -n-pentyl, and -n-hexyl. Representative branched —(C₁-C₆)alkyls include -iso-propyl, -sec-butyl, -iso-butyl, -tert-butyl, -iso-pentyl, -neopentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl, 1-methylpentyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 1-ethylbutyl, 2-ethylbutyl, 3-ethylbutyl, 1,1-dimethylbutyl, 1,2-dimethylbutyl, 1,3-dimethylbutyl, 2,2-dimethylbutyl, 2,3-dimethylbutyl, and 3,3-dimethylbutyl.

In connection with the Z group, “—(C₁-C₆)alkyl-” means a straight chain or branched non-cyclic hydrocarbon moiety having 1, 2, 3, 4, 5, or 6 carbon atoms where two hydrogen atoms on the same or a different carbon atom of the moiety are each figuratively removed and replaced by a bond to one of the two adjoining groups. Representative —(C₁-C₆)alkyl- moieties include meth-1,1-diyl, eth-1,1-diyl, eth-1,2-diyl, n-prop-1,1-diyl, n-prop-1,2-diyl, n-prop-1,3-diyl, n-but-1,1-diyl, n-but-1,2-diyl, n-but-1,3-diyl, n-but-1,4-diyl, iso-but-1,1-diyl, iso-but-1,2-diyl, iso-but-1,3-diyl, and the like.

“—(C₁-C₄)alkyl” means a straight chain or branched non-cyclic hydrocarbon having 1, 2, 3, or 4 carbon atoms. Representative straight chain —(C₁-C₄)alkyls include -methyl, -ethyl, -n-propyl, and -n-butyl. Representative branched —(C₁-C₄)alkyls include -iso-propyl, -sec-butyl, -iso-butyl, and -tert-butyl.

In connection with the Z group, “—(C₁-C₄)alkyl-” means a straight chain or branched non-cyclic hydrocarbon moiety having 1, 2, 3, or 4 carbon atoms where two hydrogen atoms on the same or a different carbon atom of the moiety are each figuratively removed and replaced by a bond to one of the two adjoining groups. Representative —(C₁-C₄)alkyl- moieties include meth-1,1-diyl, eth-1,1-diyl, eth-1,2-diyl, n-prop-1,1-diyl, n-prop-1,2-diyl, n-prop-1,3-diyl, n-but-1,2-diyl, n-but-1,3-diyl, n-but-1,4-diyl, and the like.

“—(C₁-C₃)alkyl” means a straight chain or branched non-cyclic hydrocarbon having 1, 2, or 3 carbon atoms. Representative straight chain —(C₁-C₃)alkyls include -methyl, -ethyl, and -n-propyl. Representative branched —(C₁-C₃)alkyls include -iso-propyl.

In connection with the Z group, “—(C₁-C₃)alkyl-” means a straight chain or branched non-cyclic hydrocarbon moiety having 1, 2, or 3 carbon atoms where two hydrogen atoms on the same or a different carbon atom of the moiety are each figuratively removed and replaced by a bond to one of the two adjoining groups. Representative —(C₁-C₃)alkyl- moieties include meth-1,1-diyl, eth-1,1-diyl, eth-1,2-diyl, n-prop-1,1-diyl, n-prop-1,2-diyl, n-prop-1,3-diyl, and the like.

“—(C₁-C₂)alkyl” means a straight chain non-cyclic hydrocarbon having 1 or 2 carbon atoms. Representative —(C₁-C₂)alkyls include -methyl and -ethyl.

In connection with the Z group, “—(C₁-C₂)alkyl-” means a straight chain non-cyclic hydrocarbon moiety having 1 or 2 carbon atoms where two hydrogen atoms on the same or a different carbon atom of the moiety are each figuratively removed and replaced by a bond to one of the two adjoining groups. Representative —(C₁-C₂)alkyl- moieties include meth-1,1-diyl, eth-1,1-diyl, and eth-1,2-diyl.

“—(C₂-C₁₀)alkenyl” means a straight chain or branched non-cyclic hydrocarbon having 2, 3, 4, 5, 6, 7, 8, 9, or 10 carbon atoms and including at least one carbon-carbon double bond. A branched alkenyl means that one or more straight chain —(C₁-C₈)alkyl groups, such as methyl, ethyl or propyl, replace one or both hydrogens in a —CH₂— or —CH═ group of a straight chain alkenyl. Representative straight chain and branched (C₂-C₁₀)alkenyls include -vinyl, -allyl, -1-butenyl, -2-butenyl, -iso-butylenyl, -1-pentenyl, -2-pentenyl, -3-methyl-1-butenyl, -2-methyl-2-butenyl, -2,3-dimethyl-2-butenyl, -1-hexenyl, -2-hexenyl, -3-hexenyl, -1-heptenyl, -2-heptenyl, -3-heptenyl, -1-octenyl, -2-octenyl, -3-octenyl, -1-nonenyl, -2-nonenyl, -3-nonenyl, -1-decenyl, -2-decenyl, -3-decenyl, and the like.

In connection with the Z group, “—(C₂-C₁₀)alkenyl-” means a straight chain or branched non-cyclic hydrocarbon moiety having 2, 3, 4, 5, 6, 7, 8, 9, or 10 carbon atoms and including at least one carbon-carbon double bond where two hydrogen atoms on the same or a different carbon atom of the moiety are each figuratively removed and replaced by a bond to one of the two adjoining groups. Representative —(C₂-C₁₀)alkenyl- moieties include vin-1,1-diyl, vin-1,2-diyl, prop-1-en-1,1-diyl, prop-1-en-1,2-diyl, prop-1-en-1,3-diyl, prop-2-en-1,1-diyl, prop-2-en-1,3-diyl, 2-methylprop-1-en-3,3-diyl, but-2-en-1,1-diyl, but-1-en-4,4-diyl, but-1-en-1,4-diyl, but-2-en-1,4-diyl, but-3-en-1,4-diyl, but-1-en-1,3-diyl, and the like.

“—(C₂-C₆)alkenyl” means a straight chain or branched non-cyclic hydrocarbon having 2, 3, 4, 5, or 6 carbon atoms and including at least one carbon-carbon double bond. Representative straight chain and branched (C₂-C₆)alkenyls include -vinyl, -allyl, -1-butenyl, -2-butenyl, -iso-butylenyl, -1-pentenyl, -2-pentenyl, -3-methyl-1-butenyl, -2-methyl-2-butenyl, -2,3-dimethyl-2-butenyl, -1-hexenyl, -2-hexenyl, -3-hexenyl, and the like.

In connection with the Z group, “—(C₂-C₆)alkenyl-” means a straight chain or branched non-cyclic hydrocarbon moiety having 2, 3, 4, 5, or 6 carbon atoms and including at least one carbon-carbon double bond where two hydrogen atoms on the same or a different carbon atom of the moiety are each figuratively removed and replaced by a bond to one of the two adjoining groups. Representative —(C₂-C₆)alkenyl- moieties include vin-1,1-diyl, vin-1,2-diyl, prop-1-en-1,1-diyl, prop-1-en-1,2-diyl, prop-1-en-1,3-diyl, prop-2-en-1,1-diyl, prop-2-en-1,3-diyl, 2-methylprop-1-en-3,3-diyl, but-2-en-1,1-diyl, but-1-en-4,4-diyl, but-1-en-1,4-diyl, but-2-en-1,4-diyl, but-3-en-1,4-diyl, but-1-en-1,3-diyl, and the like.

“—(C₂-C₃)alkenyl” means a straight chain non-cyclic hydrocarbon having 2 or 3 carbon atoms and including at least one carbon-carbon double bond. Representative (C₂-C₃)alkenyls include -vinyl, -allyl, and 1-prop-1-enyl.

In connection with the Z group, “—(C₂-C₃)alkenyl-” means a straight chain or branched non-cyclic hydrocarbon moiety having 2 or 3 carbon atoms and including at least one carbon-carbon double bond where two hydrogen atoms on the same or a different carbon atom of the moiety are each figuratively removed and replaced by a bond to one of the two adjoining groups. Representative —(C₂-C₃)alkenyl- moieties include vin-1,1-diyl, vin-1,2-diyl, prop-1-en-1,1-diyl, prop-1-en-1,2-diyl, prop-1-en-1,3-diyl, prop-2-en-1,1-diyl, and prop-2-en-1,3-diyl.

“—(C₂-C₁₀)alkynyl” means a straight chain or branched non-cyclic hydrocarbon having 2, 3, 4, 5, 6, 7, 8, 9, or 10 carbon atoms and including at least one carbon-carbon triple bond. A branched alkynyl means that one or more straight chain —(C₁-C₈)alkyl groups, such as methyl, ethyl or propyl, replace one or both hydrogens in a —CH₂— group of a straight chain alkynyl. Representative straight chain and branched —(C₂-C₁₀)alkynyls include -acetylenyl, -propynyl, -1-butynyl, -2-butynyl, -1-pentynyl, -2-pentynyl, -3-methyl-1-butynyl, -4-pentynyl, -1-hexynyl, -2-hexynyl, -5-hexynyl, -1-heptynyl, -2-heptynyl, -6-heptynyl, -1-octynyl, -2-octynyl, -7-octynyl, -1-nonynyl, -2-nonynyl, -8-nonynyl, -1-decynyl, -2-decynyl, -9-decynyl, and the like.

“—(C₂-C₆)alkynyl” means a straight chain or branched non-cyclic hydrocarbon having 2, 3, 4, 5, or 6 carbon atoms and including at least one carbon-carbon triple bond. Representative straight chain and branched (C₂-C₆)alkynyls include -acetylenyl, -propynyl, -1-butynyl, -2-butynyl, -1-pentynyl, -2-pentynyl, -3-methyl-1-butynyl, -4-pentynyl, -1-hexynyl, -2-hexynyl, -5-hexynyl, and the like.

“—(C₁-C₆)alkoxy” means a straight chain or branched non-cyclic hydrocarbon having one or more ether groups and 1, 2, 3, 4, 5, or 6 carbon atoms. Representative straight chain and branched (C₁-C₆)alkoxys include -methoxy, -ethoxy, -methoxymethyl, -2-methoxyethyl, -5-methoxypentyl, -3-ethoxybutyl, (methoxymethoxy)methyl-, 1-(methoxy)-1-methoxyethyl-, trimethoxymethyl-, 2-((methoxy)methoxy)-2-methylpropyl-, 3-(1,1,1-trimethoxypropane), (methoxy)trimethoxymethyl-, (2,2,2-trimethoxyethoxy)-, and the like.

“—(C₁-C₄)alkoxy” means a straight chain or branched non-cyclic hydrocarbon having one or more ether groups and 1, 2, 3, or 4 carbon atoms. Representative straight chain and branched (C₁-C₄)alkoxys include -methoxy, -ethoxy, -methoxymethyl, -2-methoxyethyl, (methoxymethoxy)methyl-, 1-(methoxy)-1-methoxyethyl-, trimethoxymethyl-, and the like.

“—(C₃-C₁₄)cycloalkyl” means a saturated monocyclic hydrocarbon having 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14 carbon atoms. Representative (C₃-C₁₄)cycloalkyls are -cyclopropyl, -cyclobutyl, -cyclopentyl, -cyclohexyl, -cycloheptyl, -cyclooctyl, -cyclononyl, -cyclodecyl, cycloundecyl, -cyclododecyl, and -cyclotetradecyl.

“—(C₃-C₁₂)cycloalkyl” means a saturated monocyclic hydrocarbon having 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 carbon atoms. Representative (C₃-C₁₂)cycloalkyls are -cyclopropyl, -cyclobutyl, -cyclopentyl, -cyclohexyl, -cycloheptyl, -cyclooctyl, -cyclononyl, -cyclodecyl, -cycloundecyl, and -cyclododecyl.

“—(C₆-C₁₂)cycloalkyl” means a saturated monocyclic hydrocarbon having 6, 7, 8, 9, 10, 11, or 12 carbon atoms. Representative (C₆-C₁₂)cycloalkyls are -cyclohexyl, -cycloheptyl, -cyclooctyl, -cyclononyl, -cyclodecyl, -cycloundecyl, and -cyclododecyl.

“—(C₄-C₈)cycloalkyl” or “4- to 8-member cycloalkyl ring” means a saturated monocyclic hydrocarbon having 4, 5, 6, 7, or 8 carbon atoms. Representative —(C₄-C₈)cycloalkyls are -cyclobutyl, -cyclopentyl, -cyclohexyl, -cycloheptyl, and -cyclooctyl.

“—(C₃-C₈)cycloalkyl” means a saturated monocyclic hydrocarbon having 3, 4, 5, 6, 7, or 8 carbon atoms. Representative (C₃-C₈)cycloalkyls include -cyclopropyl, -cyclobutyl, -cyclopentyl, -cyclohexyl, -cycloheptyl, and -cyclooctyl.

“—(C₃-C₇)cycloalkyl” means a saturated monocyclic hydrocarbon having 3, 4, 5, 6, or 7 carbon atoms. Representative (C₃-C₇)cycloalkyls include cyclopropyl, -cyclobutyl, -cyclopentyl, -cyclohexyl, and -cycloheptyl.

“—(C₆-C₁₄)bicycloalkyl” means a bicyclic hydrocarbon ring system having 6, 7, 8, 9, 10, 11, 12, 13, or 14 carbon atoms and at least one saturated cyclic alkyl ring. Representative —(C₆-C₁₄)bicycloalkyls include -indanyl, -norbornyl, -1,2,3,4-tetrahydronaphthalenyl, -5,6,7,8-tetrahydronaphthalenyl, -perhydronaphthalenyl, -bicyclo[2.2.1]hexyl, bicyclo[2.2.1.]heptyl, -bicyclo[2.2.2]octyl, -bicyclo[3.3.1]heptyl, -bicyclo[3.2.1]octyl, -bicyclo[3.3.1]nonyl, -bicyclo[3.3.2]decyl, -bicyclo[3.3.3]undecyl, -bicyclo[4.2.2]decyl, -bicyclo[4.3.2]undecyl, -bicyclo[4.3.1]decyl, and the like.

“—(C₈-C₂₀)tricycloalkyl” means a tri-cyclic hydrocarbon ring system having 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 carbon atoms and at least one saturated cyclic alkyl ring; thus, one of the rings can comprise, e.g., benzo. Representative —(C₈-C₂₀)tricycloalkyls include -pyrenyl, -adamantyl, -noradamantyl, -1,2,3,4-tetrahydroanthracenyl, -1,2,3,4,4a,9,9a,10-octahydroanthracenyl, -perhydroanthracenyl -aceanthrenyl, -1,2,3,4-tetrahydropenanthrenyl, -5,6,7,8-tetrahydrophenanthrenyl, -1,2,3,4,4a,9,10,10a-octahydrophenanthrenyl, -perhydrophenanthrenyl, -tetradecahydro-1H-cyclohepta[a]naphthalenyl, -tetradecahydro-1H-cycloocta[e]indenyl, -tetradecahydro-1H-cyclohepta[e]azulenyl, -hexadecahydrocycloocta[b]naphthalenyl, -hexadecahydrocyclohepta[a]heptalenyl, -tricyclo-pentadecanyl, -tricyclo-octadecanyl, -tricyclo-nonadecanyl, -tricyclo-icosanyl, -2,3-benzobicyclo[2.2.2]octanyl, -6,7-benzobicyclo[3.2.1]octanyl, -9,10-benzobicyclo[3.3.2]decanyl, -2,3,4,4a,9,9a-hexahydro-1H-fluorenyl, -1,2,3,4,4a,8b-hexahydrobiphenylenyl, and the like.

“—(C₃-C₁₄)cycloalkenyl” means a cyclic non-aromatic hydrocarbon having at least one carbon-carbon double bond in the cyclic system and 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14 carbon atoms. Representative (C₃-C₁₄)cycloalkenyls include -cyclopropenyl, -cyclobutenyl, -cyclopentenyl, -cyclopentadienyl, -cyclohexenyl, -cyclohexadienyl, -cycloheptenyl, -cycloheptadienyl, -cycloheptatrienyl, -cyclooctenyl, -cyclooctadienyl, -cyclooctatrienyl, -cyclooctatetraenyl, -cyclononenyl, -cyclononadienyl, -cyclononatrienyl, -cyclodecenyl, -cyclodecadienyl, -cyclotetradecenyl, -cyclododecadienyl, and the like.

“—(C₅-C₁₄)cycloalkenyl” means a cyclic non-aromatic hydrocarbon having at least one carbon-carbon double bond in the cyclic system and 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14 carbon atoms. Representative (C₅-C₁₄)cycloalkenyls include -cyclopentenyl, -cyclopentadienyl, -cyclohexenyl, -cyclohexadienyl, -cycloheptenyl, -cycloheptadienyl, -cycloheptatrienyl, -cyclooctenyl, -cyclooctadienyl, -cyclooctatrienyl, -cyclooctatetraenyl, -cyclononenyl, -cyclononadienyl, -cyclononatrienyl, -cyclodecenyl, -cyclodecadienyl, -cyclotetradecenyl, -cyclododecadienyl, and the like.

“—(C₆-C₁₂)cycloalkenyl” means a cyclic non-aromatic hydrocarbon having at least one carbon-carbon double bond in the cyclic system and 6, 7, 8, 9, 10, 11, or 12 carbon atoms. Representative (C₆-C₁₂)cycloalkenyls include -cyclohexenyl, -cyclohexadienyl, -cycloheptenyl, -cycloheptadienyl, -cycloheptatrienyl, -cyclooctenyl, -cyclooctadienyl, -cyclooctatrienyl, -cyclooctatetraenyl, -cyclononenyl, -cyclononadienyl, -cyclodecenyl, -cyclodecadienyl, -cyclododecadienyl, and the like.

“—(C₅-C₁₀)cycloalkenyl” means a cyclic non-aromatic hydrocarbon having at least one carbon-carbon double bond in the cyclic system and 5, 6, 7, 8, 9, or 10 carbon atoms. Representative (C₅-C₁₀)cycloalkenyls include -cyclopentenyl, -cyclopentadienyl, -cyclohexenyl, -cyclohexadienyl, -cycloheptenyl, -cycloheptadienyl, -cycloheptatrienyl, -cyclooctenyl, -cyclooctadienyl, -cyclooctatrienyl, -cyclooctatetraenyl, -cyclononenyl, -cyclononadienyl, -cyclodecenyl, -cyclodecadienyl, and the like.

“—(C₅-C₈)cycloalkenyl” means a cyclic non-aromatic hydrocarbon having at least one carbon-carbon double bond in the cyclic system and 5, 6, 7, or 8 carbon atoms. Representative (C₅-C₈)cycloalkenyls include -cyclopentenyl, -cyclopentadienyl, -cyclohexenyl, -cyclohexadienyl, -cycloheptenyl, -cycloheptadienyl, -cycloheptatrienyl, -cyclooctenyl, -cyclooctadienyl, -cyclooctatrienyl, -cyclooctatetraenyl, and the like.

“—(C₇-C₁₄)bicycloalkenyl” means a bicyclic hydrocarbon ring system having at least one carbon-carbon double bond in each ring and 7, 8, 9, 10, 11, 12, 13, or 14 carbon atoms. Representative —(C₇-C₁₄)bicycloalkenyls include -bicyclo[3.2.0]hept-2-enyl, -indenyl, -pentalenyl, -naphthalenyl, -azulenyl, -heptalenyl, -1,2,7,8-tetrahydronaphthalenyl, -norbornenyl, and the like.

“—(C₈-C₂₀)tricycloalkenyl” means a tricyclic hydrocarbon ring system having at least one carbon-carbon double bond in each ring and 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 carbon atoms. Representative —(C₈-C₂₀)tricycloalkenyls include -anthracenyl, -phenanthrenyl, -phenalenyl, -acenaphthalenyl, -as-indacenyl, -s-indacenyl, -2,3,6,7,8,9,10,11-octahydro-1H-cycloocta[e]indenyl, 2,3,4,7,8,9,10,11-octahydro-1H-cyclohepta[a]naphthalenyl, -8,9,10,11-tetrahydro-7H-cyclohepta[a]naphthalenyl, -2,3,4,5,6,7,8,9,10,11,12,13-dodecahydro-1H-cyclohepta[a]heptalenyl, -1,2,3,4,5,6,7,8,9,10,11,12,13,14-tetradecahydro-dicyclohepta[a,c]cyclooctenyl, -2,3,4,5,6,7,8,9,10,11,12,13-dodecahydro-1H-dibenzo[a,d]cyclononenyl, and the like.

“-(3- to 7-membered)heterocycle”, “-(3- to 7-membered)heterocyclyl”, or “-(3- to 7-membered)heterocyclo” means a 3- to 7-membered monocyclic heterocyclic ring, i.e., a monocyclic ring comprising at least one heteroatom, which is either saturated, unsaturated non-aromatic or aromatic. A 3-membered heterocycle contains 1 heteroatom, a 4-membered heterocycle can contain 1 or 2 heteroatoms, a 5-membered heterocycle can contain 1, 2, 3, or 4 heteroatoms, a 6-membered heterocycle can contain 1, 2, 3, or 4 heteroatoms, and a 7-membered heterocycle can contain 1, 2, 3, 4, or 5 heteroatoms. Each heteroatom is independently selected from nitrogen, which can be quaternized; oxygen; and sulfur, including sulfoxide and sulfone. The -(3- to 7-membered)heterocycle can be attached via a nitrogen or carbon atom. Representative -(3- to 7-membered)heterocycles include pyridyl, furyl, thiophenyl, pyrrolyl, oxazolyl, imidazolyl, thiazolidinyl, thiadiazolyl, thiazolyl, isoxazolyl, pyrazolyl, isothiazolyl, pyridazinyl, pyrimidinyl, triazinyl, morpholinyl, pyrrolidinonyl, pyrrolidinyl, piperidinyl, piperazinyl, 2,3-dihydrofuranyl, dihydropyranyl, hydantoinyl, valerolactamyl, oxiranyl, oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, dihydropyridinyl, tetrahydropyridinyl, tetrahydropyrimidinyl, tetrahydrothiophenyl, tetrahydrothiopyranyl, and the like.

“-(5- or 6-membered)heterocycle”, “-(5- or 6-membered)heterocyclyl”, or “-(5- or 6-membered)heterocyclo” means a 5- or 6-membered monocyclic heterocyclic ring, i.e., a monocyclic ring comprising at least one heteroatom, which is either saturated, unsaturated non-aromatic or aromatic. A 5-membered heterocycle can contain 1, 2, 3, or 4 heteroatoms and a 6-membered heterocycle can contain 1, 2, 3, or 4 heteroatoms. Each heteroatom is independently selected from nitrogen, which can be quaternized; oxygen; and sulfur, including sulfoxide and sulfone. The -(5- or 6-membered)heterocycle can be attached via a nitrogen or carbon atom. Representative -(5- or 6-membered)heterocycles include pyridyl, furyl, thiophenyl, pyrrolyl, oxazolyl, imidazolyl, thiazolidinyl, thiadiazolyl, thiazolyl, isoxazolyl, pyrazolyl, isothiazolyl, pyridazinyl, pyrimidinyl, triazinyl, morpholinyl, pyrrolidinonyl, pyrrolidinyl, piperidinyl, piperazinyl, 2,3-dihydrofuranyl, dihydropyranyl, hydantoinyl, valerolactamyl, tetrahydrofuranyl, tetrahydropyranyl, dihydropyridinyl, tetrahydropyridinyl, tetrahydropyrimidinyl, tetrahydrothiophenyl, tetrahydrothiopyranyl, tetrazolyl, and the like.

“-(7- to 10-membered)bicycloheterocycle”, “-(7- to 10-membered)bicycloheterocyclyl”, or “-(7- to 10-membered)bicycloheterocyclo” means a 7- to 10-membered bicyclic, heterocyclic ring, each ring of which is independently either saturated, unsaturated non-aromatic or aromatic, i.e., where at least one ring comprises at least one heteroatom. A -(7- to 10-membered)bicycloheterocycle contains 1, 2, 3, or 4 heteroatoms independently selected from nitrogen, which can be quaternized; oxygen; and sulfur, including sulfoxide and sulfone. The -(7- to 10-membered)bicycloheterocycle can be attached via a nitrogen or carbon atom. Representative -(7- to 10-membered)bicycloheterocycles include -quinolinyl, -isoquinolinyl, -2,3-dihydrobenzofuranyl, -1,3-dihydroisobenzofuranyl, -benzo[d][1,3]dioxolyl, -2,3-dihydrobenzo[b]thiophenyl, -1,3-dihydrobenzo[c]thiophenyl, -benzo[d][1,3]dithiolyl, -chromonyl, -chromanyl, -2,3-dihydrobenzo[b][1,4]dioxinyl, -thiochromonyl, -thiochromanyl, -2,3-dihydrobenzo[b][1,4]dithiinyl, -coumarinyl, -indolyl, -indolizinyl, -benzo[b]furanyl, -benzo[b]thiophenyl, -indazolyl, -purinyl, -4H-quinolizinyl, -isoquinolyl, -quinolyl, -phthalazinyl, -naphthyridinyl, -indolinyl, -isoindolinyl, -1,2,3,4-tetrahydroquinolinyl, -1,2,3,4-tetrahydroisoquinolinyl, and the like.

“—(C₃-C₁₂)cycloalkoxy” means a saturated monocyclic hydrocarbon having 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 carbon atoms where at least one of the carbon atoms is replaced by an oxygen atom. Representative (C₃-C₁₂)cycloalkoxy are -oxiranyl, -oxetanyl, -tetrahydrofuranyl, -tetrahydro-2H-pyranyl, -1,4-dioxanyl, -oxepanyl, -1,4-dioxepanyl, -oxocanyl, -1,5-dioxocanyl, -1,3,5-trioxocanyl, -oxonanyl, -1,5-dioxonanyl, -1,4,7-trioxonanyl, -oxacyclododecanyl, -1,7-dioxacyclododecanyl, and -1,5,9-trioxacyclododecanyl.

“—(C₃-C₇)cycloalkoxy” means a saturated monocyclic hydrocarbon having 3, 4, 5, 6, or 7 carbon atoms where at least one of the carbon atoms is replaced by an oxygen atom. Representative (C₃-C₇)cycloalkoxy are -oxiranyl, -oxetanyl, -tetrahydrofuranyl, -tetrahydro-2H-pyranyl, -1,4-dioxanyl, -oxepanyl, and -1,4-dioxepanyl.

“—(C₁₄)aryl” means a 14-membered aromatic carbocyclic moiety such as -anthryl or -phenanthryl.

“-(5- to 10-membered)heteroaryl” means an aromatic heterocycle ring of 5 to 10 members, including both mono- and bicyclic ring systems, i.e., a monocyclic aromatic ring comprising at least one heteroatom independently selected from nitrogen, oxygen, and sulfur or a bicyclic aromatic ring where at least one ring comprises at least one heteroatom independently selected from nitrogen, oxygen, and sulfur. In one embodiment, a monocyclic -(5- to 10-membered)heteroaryl comprises at least two heteroatoms independently selected from nitrogen, oxygen, and sulfur. In another embodiment, a bicyclic -(5- to 10-membered)heteroaryl comprises at least two heteroatoms, present in the same or in different rings, each heteroatom being independently selected from nitrogen, oxygen, and sulfur. In another embodiment, one of the -(5- to 10-membered)heteroaryl's rings contain at least one carbon atom. In another embodiment, both of the bicyclic -(5- to 10-membered)heteroaryl's rings contain at least one carbon atom. Representative -(5- to 10-membered)heteroaryls include pyridyl, furyl, benzofuranyl, thiophenyl, benzothiophenyl, quinolinyl, isoquinolinyl, pyrrolyl, indolyl, oxazolyl, benzoxazolyl, imidazolyl, benzimidazolyl, thiazolyl, benzothiazolyl, isoxazolyl, oxadiazolinyl, pyrazolyl, isothiazolyl, pyridazinyl, pyrimidyl, pyrimidinyl, pyrazinyl, thiadiazolyl, triazinyl, thienyl, cinnolinyl, phthalazinyl, and quinazolinyl.

“-(5- or 6-membered)heteroaryl” means a monocyclic aromatic heterocycle ring of 5 or 6 members, i.e., a monocyclic aromatic ring comprising at least one heteroatom independently selected from nitrogen, oxygen, and sulfur. In one embodiment, the -(5- or 6-membered)heteroaryl ring contains at least one carbon atom. Representative -(5- or 6-membered)heteroaryls include pyridyl, furyl, pyrrolyl, oxazolyl, imidazolyl, thiazolyl, isoxazolyl, 1,2,3-oxadiazolyl, 1,3,4-oxadiazolyl, 1,2,5-oxadiazolyl, 1,2,3-triazolyl, pyrazolyl, isothiazolyl, pyridazinyl, pyrimidyl, pyrazinyl, 1,2,3-thiadiazolyl, 1,3,4-thiadiazolyl, 1,2,5-thiadiazolyl, 1,3,5-triazinyl, and thiophenyl.

“—CH₂(halo)” means a methyl group where one of the hydrogens of the methyl group has been replaced with a halogen. Representative —CH₂(halo) groups include —CH₂F, —CH₂Cl, —CH₂Br, and —CH₂I.

“—CH(halo)₂” means a methyl group where two of the hydrogens of the methyl group have each been independently replaced with a halogen. Representative —CH(halo)₂ groups include —CHF₂, —CHCl₂, —CHBr₂, —CHBrCl, —CHClI, and —CHI₂.

“—C(halo)₃” means a methyl group where each of the hydrogens of the methyl group has been independently replaced with a halogen. Representative —C(halo)₃ groups include —CF₃, —CCl₃, —CBr₃, —Cl₃, —CF₂Br, —CF₂Cl, —CCl₂F, and —CFClBr.

“-Halogen” or “-halo” means —F, —Br, or —I.

“Oxo”, “═O”, and the like as used herein mean an oxygen atom doubly bonded to carbon or another element.

“Thiooxo”, “thioxo” “═S”, and the like as used herein mean a sulfur atom doubly bonded to carbon or another element.

“(C₂-C₆)bridge” as used herein means a hydrocarbon chain containing 2 to 6 carbon atoms joining two atoms of the piperidine ring of Formula (I) to form a fused bicyclic ring system. For example, compounds of the disclosure can comprise a (C₂-C₆)bridge joining positions 2 and 6 of the piperidine ring (A-B can together form a (C₂-C₆)bridge). Exemplary compounds of the disclosure include those with an unsubstituted (C₂)bridge, —CH₂—CH₂—, joining positions 2 and 6 of the piperidine ring (A-B can together form a (C₂)bridge); an unsubstituted (C₃)bridge, —CH₂—CH₂—CH₂—, joining positions 2 and 6 of the piperidine ring (A-B can together form a (C₃)bridge); an unsubstituted (C₄)bridge, —CH₂—CH₂—CH₂—CH₂—, joining positions 2 and 6 of the piperidine ring (A-B can together form a (C₄)bridge); an unsubstituted (C₅)bridge, —CH₂—CH₂—CH₂—CH₂—CH₂—, joining positions 2 and 6 of the piperidine ring (A-B can together form a (C₅)bridge); or an unsubstituted (C₆)bridge, —CH₂—CH₂—CH₂—CH₂—CH₂—CH₂—, joining positions 2 and 6 of the piperidine ring (A-B can together form a (C₆)bridge). Examples of compounds where A-B can together form a (C₂-C₆)bridge include compounds comprising the following ring systems: 8-aza-bicyclo[3.2.1]octane; 9-aza-bicyclo[3.3.1]nonane; 10-aza-bicyclo[4.3.1]decane; 11-aza-bicyclo[5.3.1]undecane; and 12-aza-bicyclo[6.3.1]dodecane. Examples of a (C₂-C₆)bridge which contains —HC═CH— within the (C₂-C₆)bridge include —HC═CH—, —CH₂—HC═CH—, —HC═CH—CH₂—, —CH₂—HC═CH—CH₂—, and the like. Examples of a (C₂-C₆)bridge which contains —O— within the (C₂-C₆)bridge include —CH₂—O—CH₂— (containing 2 carbon atoms), —CH₂—O—CH₂—CH₂— and —CH₂—CH₂—O—CH₂— (each containing 3 carbon atoms), —CH₂—CH₂—O—CH₂—CH₂—, —CH₂—O—CH₂—CH₂—CH₂— and —CH₂—CH₂—CH₂—O—CH₂— (each containing 4 carbon atoms), and the like.

In compounds of the disclosure comprising a bridge joining positions 2 and 6 of the piperidine ring (e.g., A-B can together form a (C₂-C₆)bridge), for, e.g., a compound of Formula (I), the exemplary endo bridge:

is equivalent to

In compounds of the disclosure comprising a bridge joining positions 2 and 6 of the piperidine ring (e.g., A-B can together form a (C₂-C₆)bridge), for, e.g., a compound of Formula (I), the exemplary exo bridge:

is equivalent to

In compounds of the disclosure where the —Z—R₁ group comprises a bicyclic group, that bicyclic group can have two orientations. For example, for a —Z—R₁ group that is a —(C₆-C₁₄)bicycloalkyl, e.g., bicyclo[3.3.1]nonanyl, attached directly to the piperidine ring nitrogen, the following orientations are possible:

-   -   Endo:

-   -   Exo:

As used herein in connection with “—[(C₁-C₁₀)alkyl optionally substituted by R₁₃]_(h)—”, when h is 1 means that the Z—R₁ bonded to the piperidine ring bearing A and B substituents is understood to appear as follows:

where, when i is 0, the —(C₁-C₁₀)alkyl- is unsubstituted by a R₁₃ group and, when i is 1, the —(C₁-C₁₀)alkyl- is substituted by a R₁ group at the carbon atom furthest removed from the piperidine ring bearing A and B substituents and substituted by a R₁₃ group at any carbon atom of the —(C₁-C₁₀)alkyl- including at the carbon atom furthest removed from the piperidine ring bearing A and B substituents. In one embodiment, R₁₃ is selected from:

-   -   (a) -halo, —OH, —CH₂OH, —CH₂CH₂OH, —N(R₆)₂, and —C(═O)OV₁; and     -   (b) —(C₁-C₁₀)alkyl, —(C₂-C₁₀)alkenyl, —O(C₁-C₆)alkyl,         —(C₅-C₁₀)cycloalkenyl, and -(5- or 6-membered)heterocycle, each         of which is unsubstituted or substituted with 1, 2, 3, or 4         independently selected R₈ groups; and     -   (c)

-   -    wherein R₁₄ is —H and n is an integer selected from 2, 3, 4, 5,         6, and 7;     -   (d) -phenyl and -(5- or 6-membered)heteroaryl, each of which is         unsubstituted or substituted with 1 or 2 independently selected         R₇ groups.         In another embodiment, R₁₃ is selected from:     -   (a) -halo, —OH, —CH₂OH, —CH₂CH₂OH, —N(R₆)₂, and —C(═O)OV₁; and     -   (b) —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —O(C₁-C₄)alkyl, and -(5- or         6-membered)heterocycle, each of which is unsubstituted or         substituted with 1 or 2 independently selected R₈ groups; and     -   (c)

-   -    wherein R₁₄ is —H and n is an integer selected from 2, 3, 4, 5,         6, and 7;     -   (d) -phenyl and -(5- or 6-membered)heteroaryl, each of which is         unsubstituted or substituted with 1 or 2 independently selected         R₇ groups.

“—[(C₂-C₁₀)alkenyl optionally substituted by R₁₃]—” as used herein in connection with Z—R₁ means that the Z—R₁ bonded to the piperidine ring bearing A and B substituents is understood to appear as follows:

where, when i is 0, the —(C₂-C₁₀)alkenyl- is unsubstituted by a R₁₃ group and, when i is 1, the —(C₂-C₁₀)alkenyl- is substituted by a R₁ group at the carbon atom furthest removed from the piperidine ring bearing A and B substituents and substituted by a R₁₃ group at any carbon atom of the —(C₂-C₁₀)alkenyl- including at the carbon atom furthest removed from the piperidine ring bearing A and B substituents.

As used herein in connection with formula (i) of R₁, when the dashed line is present as a bond to provide one bond of a double bond, then formula (i) is understood to appear as follows

As used herein in connection with formula (i) of R₁, when the dashed line is absent, then formula (i) is understood to appear as follows

As used herein in connection with formula (iv) of R₁₃, when the dashed line is present as a bond to provide one bond of a double bond, then formula (iv) is understood to appear as follows

As used herein in connection with formula (iv) of R₁₃, when the dashed line is absent, then formula (iv) is understood to appear as follows

The phrase “benzo,” “benzo group” and the like, when used in connection with the Q group, means

where R₂, and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I).

The phrase “pyridino,” “pyridino group” and the like, when used in connection with the Q group, means

where R₂, and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted pyridino Q group is

In another embodiment, the optionally-substituted pyridino Q group is

In another embodiment, the optionally-substituted pyridino Q group is

In another embodiment, the optionally-substituted pyridino Q group is

The phrase “pyrimidino”, “pyrimidino group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted pyrimidino Q group is

In another embodiment, the optionally-substituted pyrimidino Q group is

The phrase “pyrazino”, “pyrazino group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I).

The phrase “pyridazino”, “pyridazino group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted pyridazino Q group is

In another embodiment, the optionally-substituted pyridazino Q group is

In another embodiment, the optionally-substituted pyridazino Q group is

The phrase “pyrrolino”, “pyrrolino group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted pyrrolino Q group is

In another embodiment, the optionally-substituted pyrrolino Q group is

In another embodiment, the optionally-substituted pyrrolino Q group is

The phrase “imidazolino”, “imidazolino group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted imidazolino Q group is

In another embodiment, the optionally-substituted imidazolino Q group is

The phrase “pyrazolino”, “pyrazolino group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted pyrazolino Q group is

In another embodiment, the optionally-substituted pyrazolino Q group is

In another embodiment, the optionally-substituted pyrazolino Q group is

In another embodiment, the optionally-substituted pyrazolino Q group is

The phrase “triazolino”, “triazolino group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted triazolino Q group is

In another embodiment, the optionally-substituted triazolino Q group is

The phrase “furano”, “furano group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted furano Q group is

In another embodiment, the optionally-substituted furano Q group is

In another embodiment, the optionally-substituted furano Q group is

The phrase “oxazolino”, “oxazolino group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted oxazolino Q group is

In another embodiment, the optionally-substituted oxazolino Q group is

The phrase “isoxazolino”, “isoxazolino group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted isoxazolino Q group is

In another embodiment, the optionally-substituted isoxazolino Q group is

In another embodiment, the optionally-substituted isoxazolino Q group is

In another embodiment, the optionally-substituted isoxazolino Q group is

The phrase “oxadiazolino”, “oxadiazolino group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted oxadiazolino Q group is

In another embodiment, the optionally-substituted oxadiazolino Q group is

In another embodiment, the optionally-substituted oxadiazolino Q group is

The phrase “thiopheno”, “thiopheno group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted thiopheno Q group is

In another embodiment, the optionally-substituted thiopheno Q group is

In another embodiment, the optionally-substituted thiopheno Q group is

The phrase “thiazolino”, “thiazolino group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted thiazolino Q group is

In another embodiment, the optionally-substituted thiazolino Q group is

The phrase “isothiazolino”, “isothiazolino group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted isothiazolino Q group is

In another embodiment, the optionally-substituted isothiazolino Q group is

In another embodiment, the optionally-substituted isothiazolino Q group is

In another embodiment, the optionally-substituted isothiazolino Q group is

The phrase “thiadiazolino”, “thiadiazolino group” and the like, when used in connection with the optionally-substituted Q group, means

where R₂ and a are defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I). In one embodiment, the optionally-substituted thiadiazolino Q group is

In another embodiment, the optionally-substituted thiadiazolino Q group is

In another embodiment, the optionally-substituted thiadiazolino Q group is

The phrase “3,3-diphenylpropyl-” and the like, when used in connection with the —Z—R₁ group, means

where the 3 carbon of the propyl is indicated by the number 3 in the structure above.

In one embodiment, the phrase “optionally substituted bicyclo[3.3.1]nonyl” and the like when used in connection with the optionally-substituted R₁ group is understood to refer to one of the structures below:

where the substituents are as defined above for the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I); and where in one or more embodiments, the optionally substituted R₁ group comprises one or more of the above-recited optionally substituted bicyclo[3.3.1]nonyl structures.

In one embodiment, the phrase “optionally substituted —(C₆-C₁₄)bicycloalkyl” means

where the dashed line denotes the presence or absence of a bond. When the dashed line is present as a bond to provide one bond of a double bond, then the group above is understood to appear as follows

and when the dashed line is absent, then the optionally substituted —(C₆-C₁₄)bicycloalkyl group above is understood to appear as follows

The phrase “tetrazolyl group” means

In one embodiment, the tetrazolyl group is

In another embodiment, the tetrazolyl group is

When a first group is “substituted with one or more” second groups, one or more hydrogen atoms of the first group is replaced with a corresponding number of second groups. When the number of second groups is two or greater, each second group can be the same or different. In one embodiment, a first group is substituted with up to three second groups. In another embodiment, a first group is substituted with one or two second groups. In another embodiment, a first group is substituted with two second groups. In another embodiment, a first group is substituted with two second groups and each second group is identical. In another embodiment, a first group is substituted with only one second group.

The term “animal” includes, but is not limited to, a human or a non-human animal, such as a companion animal or livestock, e.g., a cow, monkey, baboon, chimpanzee, horse, sheep, pig, chicken, turkey, quail, cat, dog, mouse, rat, rabbit or guinea pig.

The phrase “pharmaceutically acceptable derivative”, as used herein, includes any pharmaceutically acceptable salt, solvate, prodrug, radiolabeled form, stereoisomer, enantiomer, diastereomer, other stereoisomeric form, racemic mixture, geometric isomer, and/or tautomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure.

In one embodiment, the pharmaceutically acceptable derivative is a pharmaceutically acceptable salt, solvate, prodrug, radiolabeled form, stereoisomer, enantiomer, diastereomer, other stereoisomeric form, racemic mixture, geometric isomer, and/or tautomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a pharmaceutically acceptable salt, solvate, radiolabeled form, stereoisomer, enantiomer, diastereomer, other stereoisomeric form, racemic mixture, geometric isomer, and/or tautomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a pharmaceutically acceptable salt, radiolabeled form, stereoisomer, enantiomer, diastereomer, other stereoisomeric form, racemic mixture, geometric isomer, and/or tautomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a pharmaceutically acceptable salt, radiolabeled form, stereoisomer, geometric isomer, and/or tautomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a pharmaceutically acceptable salt, solvate, stereoisomer, enantiomer, diastereomer, other stereoisomeric form, racemic mixture, geometric isomer, and/or tautomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a pharmaceutically acceptable salt, solvate, stereoisomer, geometric isomer, and/or tautomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a pharmaceutically acceptable salt, stereoisomer, geometric isomer, and/or tautomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a pharmaceutically acceptable salt, stereoisomer, and/or tautomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a pharmaceutically acceptable salt, stereoisomer, and/or tautomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure.

In another embodiment, the pharmaceutically acceptable derivative is a pharmaceutically acceptable salt, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a solvate, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a prodrug, e.g., of an Azetidine-Substituted. Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a radiolabeled form, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a stereoisomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is an enantiomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a diastereomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a stereoisomeric form other than a stereoisomer, an enantiomer and a diastereomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a racemic mixture, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a geometric isomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure. In another embodiment, the pharmaceutically acceptable derivative is a tautomer, e.g., of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure.

The phrase “pharmaceutically acceptable salt”, as used herein, is any pharmaceutically acceptable salt that can be prepared from an Azetidine-Substituted Quinoxaline-Type Piperidine Compound including a salt formed from an acid and a basic functional group, such as a nitrogen group, of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound. Illustrative salts include, but are not limited, to sulfate, citrate, acetate, trifluoroacetate, oxalate, chloride, bromide, iodide, nitrate, bisulfate, phosphate, acid phosphate, isonicotinate, lactate, salicylate, acid citrate, tartrate, oleate, tannate, pantothenate, bitartrate, ascorbate, succinate, maleate, gentisinate, fumarate, gluconate, glucoronate, saccharate, formate, benzoate, glutamate, methanesulfonate, ethanesulfonate, benzenesulfonate, p-toluenesulfonate, and pamoate (i.e., 1,1′-methylene-bis-(2-hydroxy-3-naphthoate)) salts. The term “pharmaceutically acceptable salt” also includes a salt prepared from an Azetidine-Substituted Quinoxaline-Type Piperidine Compound having an acidic functional group, such as a carboxylic acid functional group, and a pharmaceutically acceptable inorganic or organic base. Suitable bases include, but are not limited to, hydroxides of alkali metals such as sodium, potassium, cesium, and lithium; hydroxides of alkaline earth metal such as calcium and magnesium; hydroxides of other metals, such as aluminum and zinc; ammonia and organic amines, such as unsubstituted or hydroxy-substituted mono-, di-, or trialkylamines; dicyclohexylamine; tributyl amine; pyridine; picoline; N-methyl-N-ethylamine; diethylamine; triethylamine; mono-, bis-, or tris-(2-hydroxy-(C₁-C₃)alkyl amines), such as mono-, bis-, or tris-(2-hydroxyethyl)amine, 2-hydroxy-tert-butylamine, or tris-(hydroxymethyl)methylamine, N,N-di-[(C₁-C₃)alkyl]-N-(hydroxy-(C₁-C₃)alkyl)-amines, such as N,N-dimethyl-N-(2-hydroxyethyl)amine, or tri-(2-hydroxyethyl)amine; N-methyl-D-glucamine; and amino acids such as arginine, lysine, and the like. In one embodiment, the pharmaceutically acceptable salt is a hydrochloride-salt, a sulfate-salt, a sodium-salt, a potassium-salt, a benzene sulfonic acid-salt, a para-toluenesulfonic acid-salt, or a fumaric acid-salt. In another embodiment, the pharmaceutically acceptable salt is a hydrochloride-salt or a sulfate-salt. In another embodiment, the pharmaceutically acceptable salt is a hydrochloride-salt. In another embodiment, the pharmaceutically acceptable salt is a sulfate-salt. In another embodiment, the pharmaceutically acceptable salt is a sodium-salt. In another embodiment, the pharmaceutically acceptable salt is a potassium-salt. In another embodiment, the pharmaceutically acceptable salt is a para-toluenesulfonic acid-salt. In another embodiment, the pharmaceutically acceptable salt is a fumaric acid-salt. In another embodiment, the pharmaceutically acceptable fumaric acid-salt contains about one equivalent of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound and about 0.5 equivalents of fumaric acid, e.g., from about 0.3 to about 0.7 equivalents of fumaric acid in one embodiment, from about 0.4 to about 0.6 equivalents of fumaric acid in another embodiment, from about 0.44 to about 0.56 equivalents of fumaric acid in another embodiment, or from about 0.47 to about 0.53 equivalents of fumaric acid in another embodiment. In another embodiment, the pharmaceutically acceptable fumaric acid-salt contains one equivalent of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound and 0.5 equivalents of fumaric acid. One skilled in the art will recognize that, e.g., acid addition salts, of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound can be prepared by reaction of the compounds with the appropriate acid by a variety of known methods.

The compounds of the disclosure provided herein also encompass all solvates of the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds. “Solvates” are known in the art and are considered to be a combination, physical association and/or solvation of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound with a solvent molecule, e.g., a disolvate, monosolvate or hemisolvate when the solvent molecule:Azetidine-Substituted Quinoxaline-Type Piperidine Compound molecule molar ratio is 2:1, 1:1 or 1:2, respectively. This physical association involves varying degrees of ionic and covalent bonding, including hydrogen bonding. In certain instances, the solvate can be isolated, for example when one or more solvent molecules are incorporated into the crystal lattice of a crystalline solid. Thus, “solvate”, as used herein, encompasses both solution-phase and isolatable solvates. An Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure can be present as a solvated form with a pharmaceutically acceptable solvent, such as water, methanol, ethanol, and the like, and it is intended that the disclosure include both solvated and unsolvated Azetidine-Substituted Quinoxaline-Type Piperidine Compound forms. As “hydrate” relates to a particular subgroup of solvates, i.e., where the solvent molecule is water, hydrates are included within the solvates of the disclosure.

Preparation of solvates is known in the art. For example, Caira et al., “Preparation and Crystal Characterization of a Polymorph, a Monohydrate, and an Ethyl Acetate Solvate of the Antifungal Fluconazole,” J. Pharmaceut. Sci., 93(3):601-611 (2004), describes the preparation of solvates of fluconazole with ethyl acetate and with water. Similar preparations of solvates, hemisolvate, hydrates, and the like are described by Van Tonder et al., “Preparation and Physicochemical Characterization of 5 Niclosamide Solvates and 1 Hemisolvate,” AAPS Pharm. Sci. Tech., 5(1):Article 12 (2004), and Bingham et al., “Over one hundred solvates of sulfathiazole,” Chem. Comm., pp. 603-604 (2001). In one embodiment, a non-limiting, process involves dissolving the Azetidine-Substituted Quinoxaline-Type Piperidine Compound in a desired amount of the desired solvent (organic, water or mixtures thereof) at temperatures above about 20° C. to about 25° C., cooling the solution at a rate sufficient to form crystals, and isolating the crystals by known methods, e.g., filtration. Analytical techniques, for example, infrared spectroscopy, can be used to show the presence of the solvent in a crystal of the solvate.

The compounds disclosed herein also comprise all prodrugs of the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds. “Prodrugs” are known in the art and, while not necessarily possessing any pharmaceutical activity as such, are considered to be any covalently bonded carrier(s) that releases the active parent drug in vivo. In general, such prodrugs will be a functional derivative of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of Formula (I) which is readily convertible in vivo, e.g., by being metabolized, into the required Azetidine-Substituted Quinoxaline-Type Piperidine Compound of Formula (I). Conventional procedures for the selection and preparation of suitable prodrug derivatives are described in, for example, Bundgaard, ed., Design of Prodrugs, Elsevier, Amsterdam (1985); Colowick et al., “Drug and Enzyme Targeting, Part A,” Widder et al., eds., Methods in Enzymology, Vol. 112, Academic Press (1985); Bundgaard, “Design and Application of Prodrugs,” A Textbook of Drug Design and Development, Krogsgaard-Larsen and Bundgaard, eds., Harwood Academic Publishers, Chapter 5, pp. 113-191 (1991); Bundgaard et al., “(C) Means to Enhance Penetration (1) Prodrugs as a means to improve the delivery of peptide drugs,” Adv. Drug Delivery Revs. 8:1-38 (1992); Bundgaard et al., “Glycolamide Esters as Biolabile Prodrugs of Carboxylic Acid Agents: Synthesis, Stability, Bioconversion, and Physicochemical Properties,” J. Pharmaceut. Sci. 77(4):285-298 (1988); and Kakeya et al., “Studies on Prodrugs of Cephalosporins. I. Synthesis and Biological Properties of Glycyloxygenzoyloxymethyl and Glycylaminobenzoyloxymethyl Esters of 7β-[2-(2-Aminothiazol-4-yl)-(Z)-2-methoxyiminoacetamido]3-methyl-3-cephem-4-carboxylic Acid,” Chem. Pharm. Bull. 32:692-698 (1984).

In addition, one or more hydrogen, carbon or other atoms of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound can be replaced by a radioactive isotope of the hydrogen, carbon or other atoms. Such a “radiolabeled”, “radiolabeled form”, and the like of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound, each of which is encompassed by the disclosure, is useful as a research and/or diagnostic tool in metabolism pharmacokinetic studies and in binding assays. “Radioactive”, as used herein with respect to an atom, means an atom that comprises a radioactive atom and therefore the specific radioactivity thereof is above the background level of radioactivity. Examples of radioactive isotopes that can be incorporated into an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure include isotopes of hydrogen, carbon, nitrogen, oxygen, phosphorous, sulfur, fluorine, chlorine, bromine, and iodine, such as ²H, ³H, ¹¹C, ¹³C, ¹⁴C, ¹⁵N, ¹⁷O, ¹⁸O, ³¹P, ³²P, ³⁵S, ¹⁸F, ¹⁹F, ³⁶Cl, ³⁷Cl, ⁷⁶Br, ⁷⁷Br, ⁸¹Br, ¹²³I, ¹²⁴I, ¹²⁵I, and ¹³¹I, respectively. In one embodiment, a radiolabeled Azetidine-Substituted Quinoxaline-Type Piperidine Compound contains 1, 2, 3, 4, or more radioactive isotopes, each of which is independently selected from hydrogen, carbon, nitrogen, oxygen, phosphorous, sulfur, fluorine, chlorine, bromine, and iodine. In another embodiment, a radiolabeled Azetidine-Substituted Quinoxaline-Type Piperidine Compound contains 1 or 2 radioactive isotopes, each of which is independently selected from hydrogen, carbon, nitrogen, oxygen, phosphorous, sulfur, fluorine, chlorine, bromine, and iodine. In another embodiment, a radiolabeled Azetidine-Substituted Quinoxaline-Type Piperidine Compound contains 1 radioactive isotope which is selected from hydrogen, carbon, nitrogen, oxygen, phosphorous, sulfur, fluorine, chlorine, bromine, and iodine. In another embodiment, a radiolabeled Azetidine-Substituted Quinoxaline-Type Piperidine Compound contains 1, 2, 3, 4, or more radioactive isotopes, each of which is independently selected from ²H, ³H, ¹¹C, ¹³C, ¹⁴C, ¹⁵N, ¹⁷O, ¹⁸O, ³¹P, ³²P, ³⁵S, ¹⁸F, ¹⁹F, ³⁶Cl, ³⁷Cl, ⁷⁶Br, ⁷⁷Br, ⁸¹Br, ¹²³I, ¹²⁴I, ¹²⁵I, and ¹³¹I. In another embodiment, a radiolabeled Azetidine-Substituted Quinoxaline-Type Piperidine Compound contains 1 or 2 radioactive isotopes, each of which is independently selected from ²H, ³H, ¹¹C, ¹³C, ¹⁴C, ¹⁵N, ¹⁷O, ¹⁸O, ³¹P, ³²P, ³⁵S, ¹⁸F, ¹⁹F, ³⁶Cl, ³⁷Cl, ⁷⁶Br, ⁷⁷Br, ⁸¹Br, ¹²³I, ¹²⁴I, ¹²⁵I, and ¹³¹I. In another embodiment, a radiolabeled Azetidine-Substituted Quinoxaline-Type Piperidine Compound contains 1 radioactive isotope which is selected from ²H, ³H, ¹¹C, ¹³C, ¹⁴C, ¹⁵N, ¹⁷O, ¹⁸O, ³¹P, ³²P, ³⁵S, ¹⁸F, ¹⁹F, ³⁶Cl, ³⁷Cl, ⁷⁶Br, ⁷⁷Br, ⁸¹Br, ¹²³I, ¹²⁴I, ¹²⁵I, and ¹³¹I. In another embodiment, a radiolabeled Azetidine-Substituted Quinoxaline-Type Piperidine Compound contains 1, 2, 3, 4, or more radioactive isotopes, each of which is independently selected from ²H, ³H, ¹³C, ¹⁴C, ¹⁵N, ¹⁸O, ³²P, and ¹²⁵I. In another embodiment, a radiolabeled Azetidine-Substituted Quinoxaline-Type Piperidine Compound contains 1 or 2 radioactive isotopes, each of which is independently selected from ³H, ¹⁴C, ¹⁵N, ¹⁸O, ³²P, and ¹²⁵I. In another embodiment, a radiolabeled Azetidine-Substituted Quinoxaline-Type Piperidine Compound contains 1 radioactive isotope which is selected from ³H, ¹⁴C, ¹⁵N, ¹⁸O, ³²P, and ¹²⁵I.

Radiolabeled compounds of the disclosure can be prepared by methods known in the art. For example, tritiated Azetidine-Substituted Quinoxaline-Type Piperidine Compounds can be prepared by introducing tritium into the particular Azetidine-Substituted Quinoxaline-Type Piperidine Compound, for example, by catalytic dehalogenation with tritium. This method can include reacting a suitably halogen-substituted precursor of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound with tritium gas in the presence of a suitable catalyst, for example, Pd/C, in the presence or absence of a base. Other suitable methods for preparing tritiated compounds can be found in Filer, “The Preparation and Characterization of Tritiated Neurochemicals,” Isotopes in the Physical and Biomedical Sciences, Vol. 1, Labeled Compounds (Part A), E. Buncel et al, eds., Chapter 6, pp. 155-192 (1987). ¹⁴C-labeled compounds can be prepared by employing starting materials having a ¹⁴C carbon. Compounds containing piperazine isotopcially enriched with ¹³C and/or ¹⁵N can be prepared as described in, e.g., FIG. 5A and the associated description, of U.S. Pat. No. 7,355,045 B2. Radiolabeled compounds containing ¹⁸F at the 6-position of an aniline ring can be prepared as described in column 27 of U.S. Pat. No. 6,562,319 B2.

An Azetidine-Substituted Quinoxaline-Type Piperidine Compound can contain one or more asymmetric centers and can thus give rise to enantiomers, diastereomers, and other stereoisomeric forms. Unless specifically otherwise indicated, the disclosure encompasses compounds with all such possible forms as well as their racemic and resolved forms or any mixture thereof. The art recognizes that a geometric isomer is encompassed by a stereoisomer (See, e.g., the definitions of “stereoisomers” and “cis-trans isomers” appearing in the IUPAC Compendium of Chemical Terminology, 2^(nd) Ed. (the “Gold Book”), McNaught et al., eds., Blackwell Scientific Publications, Oxford (1997)). When an Azetidine-Substituted Quinoxaline-Type Piperidine Compound contains an olefinic double bond or other center of geometric asymmetry, and unless specifically otherwise indicated, it is intended to include all “geometric isomers”, e.g., both E and Z geometric isomers. Unless specifically otherwise indicated, all “tautomers”, e.g., ketone-enol, amide-imidic acid, lactam-lactim, enamine-imine, amine-imine, and enamine-enimine tautomers, are intended to be encompassed by the disclosure as well.

As used herein, the terms “stereoisomer”, “stereoisomeric form”, and the like are general terms for all isomers of individual molecules that differ only in the orientation of their atoms in space. It includes enantiomers and isomers of compounds with more than one chiral center that are not mirror images of one another (“diastereomers”).

The term “chiral center” refers to a carbon atom to which four different groups are attached.

The term “enantiomer” or “enantiomeric” refers to a molecule that is nonsuperimposable on its mirror image and hence optically active where the enantiomer rotates the plane of polarized light in one direction and its mirror image rotates the plane of polarized light in the opposite direction.

The term “racemic” refers to a mixture of equal parts of enantiomers which is optically inactive.

The term “resolution” refers to the separation or concentration or depletion of one of the two enantiomeric forms of a molecule. Optical isomers of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound can be obtained by known techniques such as chiral chromatography or formation of diastereomeric salts from an optically active acid or base.

Optical purity can be stated in terms of enantiomeric excess (% ee) and/or diastereomeric excess (% de), each which is determined by the appropriate formula below:

${\%\mspace{14mu}{ee}} = {\left\lbrack \frac{{{major}\mspace{14mu}{{enantiomer}({mol})}} - {{minor}\mspace{14mu}{{enantiomer}({mol})}}}{{{major}\mspace{14mu}{{enantiomer}({mol})}} + {{minor}\mspace{14mu}{{enantiomer}({mol})}}} \right\rbrack \times 100\%}$ ${\%\mspace{14mu}{de}} = {\left\lbrack \frac{{{major}\mspace{14mu}{{diastereomer}({mol})}} - {{minor}\mspace{14mu}{{diastereomer}({mol})}}}{{{major}\mspace{14mu}{{diastereomer}({mol})}} + {{minor}\mspace{14mu}{{diastereomer}({mol})}}} \right\rbrack \times 100{\%.}}$

The term “MeOH” means methanol, i.e., methyl alcohol. The term “EtOH” means ethanol, i.e., ethyl alcohol. The term “Et₂O” means diethyl ether, i.e., ethoxyethane. The term “THF” means tetrahydrofuran. The term “DMF” means N,N-dimethylformamide. The term “DCM” means methylene chloride, i.e., dichloromethane or CH₂Cl₂. The term “DCE” means 1,2-dichloroethane. The term “EtOAc” means ethyl acetate. The term “MeCN” means acetonitrile. The term “DMSO” means dimethylsulfoxide, i.e., methylsulfinylmethane. The term “MTBE” means tert-butyl methyl ether, i.e., 2-methoxy-2-methylpropane. The term “AcOH” means acetic acid. The term “TEA” means triethylamine. The term “DIEA” means diisopropylethylamine, i.e., N-ethyl-N-isopropylpropan-2-amine. The term “Bn” means benzyl, i.e.:

The term “BOC” means tert-butyloxycarbonyl, i.e.:

The term “mesylate” means:

The term “tosylate” means:

The term “IBD” means inflammatory-bowel disease. The term “IBS” means irritable-bowel syndrome. The term “ALS” means amyotrophic lateral sclerosis.

The phrase “effective amount”, when used in connection with an Azetidine-Substituted Quinoxaline-Type Piperidine Compound, means an amount effective for: (a) treating or preventing a Condition or symptom thereof; (b) detectably inhibiting ORL-1 receptor function in a cell; or (c) detectably activating ORL-1 receptor function in a cell.

The phrase “effective amount”, when used in connection with a second therapeutic agent means an amount for providing the therapeutic effect of the second therapeutic agent.

The terms “modulate”, “modulating”, and the like as used herein with respect to the ORL-1 receptor mean the mediation of a pharmacodynamic response (e.g., analgesia) in an animal from (i) inhibiting or activating the receptor, or (ii) directly or indirectly affecting the normal regulation of the receptor activity. Compounds that modulate the receptor activity include agonists, partial agonists, antagonists, mixed agonists/antagonists, mixed partial agonists/antagonists and compounds which directly or indirectly affect regulation of the receptor activity.

As used herein, a compound that binds to a receptor and mimics the regulatory effect(s) of an endogenous ligand is defined as an “agonist”. As used herein, a compound that binds to a receptor and is only partly effective as an agonist is defined as a “partial agonist”. As used herein, a compound that binds to a receptor but produces no regulatory effect, but rather blocks binding of another agent to the receptor is defined as an “antagonist”. (See Ross et al., “Pharmacodynamics: Mechanisms of Drug Action and the Relationship Between Drug Concentration and Effect,” in Goodman & Gilman's The Pharmacological Basis of Therapeutics pp. 31-43 (Goodman et al., eds., 10^(th) Ed., McGraw-Hill, New York 2001)).

The phrases “treatment of”, “treating”, and the like include the amelioration or cessation of a Condition or a symptom thereof. In one embodiment, treating includes inhibiting, for example, decreasing the overall frequency of episodes of a Condition or a symptom thereof.

The phrases “prevention of”, “preventing”, and the like include the avoidance of the onset of a Condition or a symptom thereof.

A “disorder” includes, but is not limited to, the Conditions defined above.

In the event of doubt as to the agreement of a depicted chemical structure and a chemical name, the depicted chemical structure governs.

It is appreciated that various features of the disclosure which are, for clarity, described in the context of separate embodiments, can also be provided in combination in a single embodiment unless otherwise specifically herein excluded. Conversely, various features of the disclosure which are, for brevity, described in the context of a single embodiment, can also be provided separately and/or in any suitable subcombination unless otherwise specifically herein excluded.

4.3 METHODS FOR MAKING AZETIDINE-SUBSTITUTED QUINOXALINE-TYPE PIPERIDINE COMPOUNDS

Azetidine-Substituted Quinoxaline-Type Piperidine Compounds can be made using conventional organic synthesis, in view of the present disclosure, and including the following illustrative methods shown in the schemes below where R₁, R₂, R₃, Z, A, B, a, and b are defined above, L is a halogen leaving group such as Br or I, L′ is F or Cl, R is —(C₁-C₄)alkyl or —CF₃, and R′ is —(C₁-C₄)alkyl. For simplicity, in the following schemes the exemplary Q group is benzo which is sometimes unsubstituted with R₂; however, the schemes are also applicable to substituted benzo and any of the (5- or 6-membered)heteroaryl Q groups, whether unsubstituted or optionally substituted. Furthermore, Section 4.3.1 describes methods for making Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I) where Y₁ is oxygen, i.e., referred to as Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I′) in the schemes below. Section 4.3.2 describes methods for making Azetidine-Substituted Quinoxaline-Type Piperidine Compound of Formula (I) where Y₁ is sulfur, i.e., referred to as Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I″) in the schemes below.

4.3.1 Methods for Making Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I′) from Quinoxaline-2,3(1H,4H)-diones

Preparation of Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I′) can be carried out through the reaction of a quinoxaline-2,3(1H,4H)-dione (e.g., Compound A5) with a chlorinating agent followed by reaction with an azetidine. Six alternative methods for preparing Compound A5 are shown in Schemes A-F below. Methods for chlorinating Compound A5 to produce Compound G1 are shown in Schemes G and H below. Methods for making Compounds of Formula (I′) from Compound G1 are shown in Scheme I below.

4.3.1.1 Methods for Making Compound A5

Six alternative methods for making Compound A5 are shown below.

4.3.1.1.1 Synthesis of Compound A5 Method 1 (Scheme A)

In Scheme A and the other schemes, “Lit 1” refers to the procedures described in the publications Tortolani et al., “A Convenient Synthesis to N-Aryl-Substituted 4-Piperidones,” Org. Lett. 1:1261-1262 (1999) and/or International PCT Publication No. WO 2005/075459 A1 of Euro-Celtique S.A., “Lit 2” refers to the procedures described in U.S. Pat. No. 6,635,653 by Goehring et al., and “Lit 3” refers to the procedures described in the publication Dudash et al., “Synthesis and evaluation of 3-anilino-quinoxalinones as glycogen phosphorylase inhibitors,” Bioorg. Med. Chem. Lett., 15(21):4790-4793 (2005).

Compounds A1 and A2 are commercially available or can be prepared by methods known to the art.

A piperidinium salt of structure A1 can be reacted with a primary amine in a suitable solvent, such as ethanol, under reflux conditions in the presence of a base, such as potassium carbonate, as described in reference “Lit 1” to provide the 1-(substituted)piperidine-4-one Compound A3. As described in reference “Lit 2,” Compound A3 can also be prepared by alkylation of a piperidine-4-one of structure A2 with an alkyl bromide or alkyl iodide in a suitable solvent, such as dimethyl formamide, acetonitrile or dimethyl sulfoxide, in the presence of an inorganic base, such as potassium carbonate, or an organic base, such as DIEA. As described in reference “Lit 2,” Compound A3 can also be prepared by reductive amination of Compound A2 with an aldehyde or ketone using either sodium triacetoxyborohydride or sodium cyanoborohydride in a suitable solvent, such as dichloromethane or methanol, respectively. Compound A3 can then be reductively aminated with a substituted or unsubstituted 1,2-phenylenediamine using sodium triacetoxyborohydride or sodium cyanoborohydride in a suitable solvent, such as dichloromethane or methanol, respectively, to provide Compound A4, as described in reference “Lit 2.” Compound A4 can be dissolved in a suitable solvent, such as toluene, and reacted with ethyl 2-chloro-2-oxoacetate in the presence of a base, such as TEA, followed by treatment with an alkali metal alkoxide, such as sodium ethoxide, in a suitable solvent, such as methanol or ethanol, to provide Compound A5.

4.3.1.1.2 Synthesis of Compound A5 Method 2 (Scheme B)

In Scheme B and the other schemes, “Lit 1b” refers to the procedures described in International PCT Publication No. WO 2005/075459 A1 of Euro-Celtique S.A.

As described in reference “Lit 1b,” Compound A3 can be reacted with 50% aqueous hydroxylamine in a suitable solvent, such as hexanes, to provide an intermediate hydroxylamine which can be converted to an oxime by dehydration in a suitable solvent, such as toluene, under reflux conditions using a Dean-Stark apparatus. The oxime intermediate can be reduced to the primary amine Compound B1 by catalytic hydrogenation using a catalyst, such as rhodium on alumina, in a suitable solvent, such as ethanol, under a hydrogen atmosphere at a pressure of 1 atm or greater in a suitable apparatus, such as a Parr Hydrogenator, according to reference “Lit 1b.” Compound B1 can be reacted with ethyl 2-chloro-2-oxoacetate in the presence of a base, such as TEA, to provide Compound B2. Compound B2 can be reacted with a substituted or unsubstituted 2-halo-1-nitrobenzene (where the halo is fluoride or chloride) in the presence of a base, such as potassium carbonate, in a suitable solvent, such as acetonitrile, under reflux conditions to provide Compound B3. Compound B3 can be treated with a hydrogenation catalyst, such as Raney nickel, in a suitable solvent, such as ethanol, under a hydrogen atmosphere, and the product immediately treated with an alkali metal alkoxide, such as sodium ethoxide, in a suitable solvent, such as methanol or ethanol, to provide Compound A5.

4.3.1.1.3 Synthesis of Compound A5 Method 3 (Scheme C)

In Scheme C and the other schemes, “Lit 4” refers to the reference Rylander, “Hydrogenation of Nitro Compounds,” in Hydrogenation Methods pp. 104-116 (Academic Press, London, 1985), which provides a review of the methods available for the reduction of nitro groups, and “Lit 5” refers to the Zinin reduction procedures described in the reference Porter, “The Zinin Reduction of Nitroarenes,” Org. Reactions, 20:455-481 (1973).

Compound C1 is commercially available or can be prepared by methods known to the art. Compound C1 can be reacted with an acid chloride RC(═O)Cl, such as 2,2,2-trifluoroacetyl chloride, or anhydride (RC(═O))₂O, such as 2,2,2-trifluoroacetic anhydride, and a base, such as TEA, in a suitable solvent, such as dichloromethane or tetrahydrofuran, to provide Compound C2. Compound C2 can be converted to Compound C3 in a two step procedure by hydrolysis of the ester to the carboxylic acid using an appropriate base, such as aqueous NaOH, followed by treatment with diphenyl phosphorazidate (“(PhO)₂P(═O)N₃”) and phenylmethanol (“BnOH”) under Curtius rearrangement conditions. The benzyloxycarbonyl group of Compound C3 can then be removed under hydrogenolysis conditions using a noble metal catalyst, e.g., palladium on carbon, under a hydrogen atmosphere, to provide Compound C4. Compound C4 can be reacted with a substituted or unsubstituted 2-halo-1-nitrobenzene (where the halo is fluoride or chloride) (similar to steps described in Scheme B) to provide Compound C5. In the next step, Compound C5 can be converted to Compound C6 using a catalyst, such as Raney nickel, in a suitable solvent, such as ethanol, under a hydrogen atmosphere as described in reference “Lit 4.” Compound C5 can also be converted to Compound C6 by chemical means, such as with Zn, Sn(II) chloride or Fe, or using sulfides or polysulfides by the Zinin Reduction as described in reference “Lit 5.” Compound C6 can then be treated with ethyl 2-chloro-2-oxoacetate and a base, such as TEA, in a suitable solvent, such as toluene, followed by treatment with an alkali metal alkoxide, such as sodium ethoxide, in a suitable solvent, such as ethanol, to provide Compound C7. Compound A5 can be prepared by alkylation of Compound C7 with an alkyl bromide or alkyl iodide or by reductive amination of Compound C7 with an aldehyde or ketone, each as described in Scheme A.

4.3.1.1.4 Synthesis of Compound A5 Method 4 (Scheme D)

Compound D1 is commercially available or can be prepared from Compound C1 by methods known to the art. Compound D2 can be prepared from Compound D1 in a similar manner to the preparation of Compound C4 from Compound C1 in Scheme C. Compound D2 can be reacted with a substituted or unsubstituted 2-halo-1-nitrobenzene (where the halo is fluoride or chloride) (similar to steps described in Scheme B) to provide Compound D3. In the next step (similar to steps described in Scheme B), Compound D3 can be converted to Compound D4 by treatment with a hydrogenation catalyst, such as Raney nickel, in a suitable solvent, such as ethanol, under a hydrogen atmosphere, or by chemical means using a reducing agent, such as Zn, Sn(II) chloride or Fe, or using sulfide or polysulfides by the Zinin Reduction as described in Scheme C. Thereafter (similar to steps described in Scheme A), Compound D4 can be treated with ethyl 2-chloro-2-oxoacetate in the presence of a base, such as TEA, followed by treatment with an alkali metal alkoxide, such as sodium ethoxide, in a suitable solvent, such as ethanol, to provide Compound D5. Compound D5 can be hydrogenolyzed using a noble metal catalyst, e.g., palladium on carbon, in a suitable solvent, such as methanol or ethanol, under a hydrogen atmosphere to provide Compound C7. Compound A5 can be prepared by alkylation of Compound C7 with an alkyl bromide or alkyl iodide or by reductive amination of Compound C7 with an aldehyde or ketone (similar to steps described in Scheme C).

4.3.1.1.5 Synthesis of Compound A5 Method 5 (Scheme E)

As shown in Scheme E, Compound A3 can be converted to Compound E1 under reductive amination conditions using a BOC protected, substituted or unsubstituted 1,2-phenylenediamine and a reducing agent, such as sodium triacetoxyborohydride or sodium cyanoborohydride, in a suitable solvent, such as dichloromethane or methanol, respectively as described in reference “Lit 2.” The BOC protecting group can be removed using acidic conditions, such as using HCl or 2,2,2-trifluoroacetic acid, to provide an intermediate which can be converted to Compound A5 in a two step procedure using ethyl 2-chloro-2-oxoacetate and a base, such as TEA, followed by reaction with an alkali metal alkoxide, such as sodium ethoxide, in a suitable solvent, such as ethanol. Where substituent groups A and B together form a bridge, e.g., a two carbon bridge, the “exo” and “endo” isomers which result can be conveniently separated using flash column chromatography.

4.3.1.1.6 Synthesis of Compound A5 Method 6 (Scheme F)

In Scheme F, Compound A5 can be prepared as described in U.S. Patent Application Publication US 2010/0022519 A1 for example, at paragraph [1364] and thereafter. Briefly, the primary amine F1, where —Z—R₁ can be cyclooctyl, adamantyl or noradamantyl, for example, can be treated with a piperidone salt in a polar solvent, such as ethanol or methanol containing water, and an inorganic base, such as potassium carbonate, under reflux for from about 4 hours to about 6 hours to provide Compound F2. Compound F2 can then be treated with a substituted or unsubstituted 1,2-phenylenediamine and acetic acid in a solvent, such as tetrahydrofuran or 1,2-dimethoxyethane, to provide an imine, which can be reduced with sodium triacetoxyborohydride to provide Compound F3. Compound F3 can be treated with oxalyl dichloride in a non-aqueous solvent, such as dichloromethane, and a base, such as TEA, to provide an amide which can be cyclized to a Compound A5 using potassium carbonate in a polar solvent, such as ethanol.

4.3.1.2 Methods for Making Compound G1 from Compound A5

Two alternative methods for making Compound G1 from Compound A5 are shown below.

4.3.1.2.1 Synthesis of Compound G1 Method 1 (Scheme G)

In Scheme G, Compound G1 can be obtained by chlorinating Compound A5, e.g., by adding a chlorinating agent, such as thionyl chloride, phosphorus oxychloride or phosphorus pentachloride, to a mixture of Compound A5, DMF, and a base, such as TEA, in a solvent with a high boiling point, such as toluene or xylene, under reflux conditions such as is described in reference “Lit 3.”

4.3.1.2.2 Synthesis of Compound G1 Method 2 (Scheme H)

In Scheme H, Compound A2 can be converted to the 2-chloroquinoxaline Compound G1 using thionyl chloride in a solvent, such as dichloromethane, using the procedures described in, e.g., Pizey, “Thionyl Chloride,” Ch. 4 in Synthetic Reagents, John Wiley & Sons, New York, Vol. 1, pp. 321-357 (1974).

4.3.1.3 Methods for Making Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I′) from Compound G1

In Scheme I, Compound G1 is reacted with azetidine Compound I1 in the presence of a base (e.g., TEA) to provide an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of Formula (I′). In one embodiment, the reaction is carried out in an organic solvent, such as acetonitrile or dimethyl sulfoxide, at elevated temperature (e.g., 80° C. to 100° C.).

4.3.2 Methods for Making Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I″) from Quinoxaline-2,3(1H,4H)-dithiones

Preparation of Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I″), where Y₁ is sulfur, can be carried out through the reaction of a quinoxaline-2,3(1H,4H)-dithione (e.g., Compound J1) with a halogenating agent followed by reaction with an azetidine. Preparation of Compound J1 from Compound A5 (Scheme J) and subsequent conversion of Compound J1 to an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of Formula (I″) (Scheme K) are described below.

4.3.2.1 Synthesis of Compound J1 from Compound A5

In Scheme J and the other schemes, “Lit 6” refers to the reference Perregaard et al., “Studies on Organophosphorus Compounds XVIII*. Oxidation of Tertiary Alicyclic Amines with Elemental Sulfur in Hexa-methylphosphoric Triamide (HMPA). Oxidative Rearrangements of Hexahy-Droazepines and Octahydroazocines to bis(3-Pyrrolyl)Polysulfides.,” Bull. Soc. Chim. Belg. 86:679-691 (1977).

Compound J1, comprising a quinoxaline-2,3(1H,4H)-dithione, can be made by, e.g., reacting Compound A5 (i.e., comprising a quinoxaline-2,3(1H,4H)-dione) with Lawesson's reagent (i.e., 2,4-bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4-disulfide) according to the procedure described in reference “Lit 6.” In one embodiment, Compound J1 can be made by reacting Compound A5 with Lawesson's reagent in a nonpolar solvent, such as THF or toluene, at a temperature of about 100° C. for about 2-3 hours as shown above.

4.3.2.2 Synthesis of Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I″) from Compound J1

In Scheme K, Compound J1 is dissolved in a suitable solvent, such as toluene, and reacted with methyl iodide in the presence of a base, such as DIEA, to generate an intermediate compound which is reacted with azetidine Compound I1 to provide an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of Formula (I″).

4.3.3 Methods for Making Specific Stereoisomeric Forms of Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I)

Specific stereoisomeric forms of Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I) can be synthesized using methods described above. As described below, the desired stereochemical form can be introduced into the optionally-bridged piperidine portion of the molecule prior to the addition of the quinoxaline portion of the molecule.

4.3.3.1 Synthesis of Stereoisomeric Forms of Piperidine Precursors

In Scheme L, Compound L3 can be prepared according to the methods described in U.S. Patent Application Publication US 2010/0216726 A1 for example, at paragraph [1745] and thereafter. Briefly, Compound L1 can be converted to oxime Compound L2 using aqueous hydroxylamine in an acidic solvent, such as acetic acid. Compound L2 can be reduced to an endo amine Compound L3 by hydrogenation using a noble metal catalyst, such as platinum oxide, in a solvent, such as acetic acid.

4.3.3.2 Alternative Synthesis of Stereoisomeric Forms of Piperidine Precursors

In Scheme M and the other schemes, “Lit 7” refers to Berdini et al., “A Modified Palladium Catalyzed Reductive Amination Procedure,” Tetrahedron, 58:5669-5674 (2002) and “Lit 8” refers to Lewin et al., “Molecular Features Associated with Polyamine Modulation of NMDA Receptors,” J. Med. Chem. 41:988-995 (1998).

Compound L1, where substituent groups A and B together form a bridge, e.g., a two carbon bridge, is commercially available or can be prepared by methods known to the art.

When substituent groups A and B together form a bridge, e.g., a two carbon bridge, Compound L1 can be converted to Compound L3, the “endo” isomer, under reductive amination conditions using, e.g., ammonium formate and a noble metal catalyst, e.g., palladium on carbon, in a solvent, such as ethanol or methanol, as described in reference “Lit 7.” Similarly, where substituent groups A and B together form a bridge, e.g., a two carbon bridge, Compound L1 can be reacted with aqueous hydroxylamine in a solvent, such as hexanes, to form an intermediate hydroxylamine, which can be converted to its oxime by dehydration in a solvent with a high boiling point, such as toluene, under Dean-stark conditions. The oxime intermediate can be converted to Compound M1, the “exo” isomer, by reduction using, e.g., sodium in propanol as described in reference “Lit 8.”

4.3.3.3 Synthesis of Stereoisomeric Forms of Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of Formula (I) from Compound L3

In Scheme N, Compound N2 can be prepared according to the methods described in U.S. Patent Application Publication US 2010/0216726 A1, for example, at paragraph [1745] and thereafter. Briefly, amine Compound L3 or its salt, such as the acetate, can be reacted with a substituted or unsubstituted 2-fluoronitrobenzene in a polar solvent, such as acetonitrile or DMF, and a base, such as TEA or potassium carbonate, to provide Compound N1. Compound N1 can be reduced to Compound N2 by hydrogenation using a noble metal catalyst, such as palladium on charcoal or Raney nickel, in a solvent, such as ethyl acetate or dichloromethane. Thereafter, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of Formula (I′) can be prepared using methods described in Section 4.3.1. Alternatively, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of Formula (I″) can be prepared by using methods described in Sections 4.3.1.1 and 4.3.2. In these embodiments, the final product of the reaction, i.e., the Azetidine-Substituted Quinoxaline-Type Piperidine Compound of Formula (I), has a percent diastereomeric excess (% de) of at least about 90%. In another embodiment, the final product of the reaction has a % de of at least about 95%. In another embodiment, the final product of the reaction has a % de of at least about 97%. In another embodiment, the final product of the reaction has a % de of at least about 98%. In another embodiment, the final product of the reaction has a % de of at least about 99%. In another embodiment, the final product of the reaction has a % de of greater than 99% (e.g., 99.1% to 99.9%).

4.3.4 Methods for Making 3-Chloroquinoxalin-2(1H)-one Intermediates and Azetidine-Substituted Quinoxaline-Type Piperidine Compounds Comprising a 3-(Bicyclo[3.3.1]nonanyl) R₁ Group

In Scheme O, 2-adamantanone O1 can be dissolved in trifluoroacetic acid and treated with a peracid, such sodium percarbonate, at from about 20° C. to about 30° C. to provide a lactone Compound O2. Compound O2 can be hydrolyzed to a hydroxyl acid using sodium hydroxide in a solvent, such as methanol, under reflux. The stereochemistry of the acid epimerizes from endo to exo. The hydroxyl acid can be dehydrated to Compound O3 using an acid, such as methanesulfonic acid, in a solvent, such as toluene, by azeotropic drying. Compound O3 can be hydrogenated using a catalyst, such as palladium on charcoal, in a mixed solvent system, such as methanol and ethyl acetate, to provide a mixture of acid Compound O4 and its methyl ester (Compound O4′, not shown). The mixture can be hydrolyzed to the acid Compound O4 using sodium hydroxide in aqueous methanol. Compound O4 can be converted to Compound O5 using di-phenyl phosphoryl azide and TEA in a solvent, such as toluene, in a Curtius type reaction to provide an isocyanate that can be hydrolyzed to the amine of Compound O5 using sodium hydroxide in aqueous tetrahydrofuran or another aprotic water miscible solvent. The isolated amine of Compound O5 can be converted to its hydrochloride salt by treatment with hydrochloric acid. Compound O5 can be converted to a 2-chloroquinoxaline Compound O6 according to the methods described in Sections 4.3.1.1 and 4.3.1.2. Compound O6 can be converted to an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of Formula (I′), i.e., Azetidine-Substituted Quinoxaline-Type Piperidine Compound O7, according to the method described in Section 4.3.1.3.

4.3.5 Methods for Making 3-Chloroquinoxalin-2(1H)-one Intermediates and Azetidine-Substituted Quinoxaline-Type Piperidine Compounds Comprising a 3-(7-Methylbicyclo[3.3.1]nonanyl) R₁ Group

In Scheme P, 1,3-dihydroxyadamantane P1 can be treated with p-toluenesulfonyl chloride in pyridine at a temperature of about 70° C. for from about 2 h to about 6 h to provide Compound P2. Compound P2 can be hydrogenated to Compound P3 using platinum oxide in a non-polar solvent, such cyclohexane. Compound P3 can be converted to the oxime Compound P4 using hydroxylamine in acetic acid at a temperature from about 25° C. to about 40° C. Compound P4 can be reacted with sodium metal and iso-propanol in a solvent, such as toluene, at a temperature of about 100° C. to provide the amine of Compound P5. The isolated amine of Compound P5 can be converted to its hydrochloride salt by treatment with hydrochloric acid in a solvent, such as diethyl ether. Compound P5 can be converted to Compound P6 according to the methods described in Sections 4.3.1.1 and 4.3.1.2. Compound P6 can be converted to an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of Formula (I′), i.e., Azetidine-Substituted Quinoxaline-Type Piperidine Compound P7, according to the method described in Section 4.3.1.3.

4.4 THERAPEUTIC USES OF THE AZETIDINE-SUBSTITUTED QUINOXALINE-TYPE PIPERIDINE COMPOUNDS

In accordance with the disclosure, the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds are administered to an animal in need of treatment or prevention of a Condition.

In one embodiment, an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound can be used to treat or prevent any condition treatable or preventable by inhibiting the activity of the ORL-1 receptor. Examples of Conditions that are treatable or preventable by inhibiting the activity of the ORL-1 receptor include, but are not limited to: pain, memory disorders, obesity, constipation, depression, dementia, and Parkinsonism.

In another embodiment, an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound can be used to treat or prevent any condition treatable or preventable by activating the ORL-1 receptor. Examples of Conditions that are treatable or preventable by activating the ORL-1 receptor include, but are not limited to, pain, anxiety, cough, diarrhea, blood pressure disorder (via vasodilation and via diuresis), epilepsy, anorexia/cachexia, urinary incontinence, and drug abuse.

The Azetidine-Substituted Quinoxaline-Type Piperidine Compounds can be used to treat or prevent acute or chronic pain. Examples of pain that can be treated or prevented using an Azetidine-Substituted Quinoxaline-Type Piperidine Compound include, but are not limited to, cancer pain, neuropathic pain, labor pain, myocardial infarction pain, pancreatic pain, colic pain, post-operative pain, headache pain, muscle pain, arthritic pain, and pain associated with a periodontal disease, including gingivitis and periodontitis.

The Azetidine-Substituted Quinoxaline-Type Piperidine Compounds can also be used to treat or prevent pain associated with inflammation or with an inflammatory disease in an animal. Such pain can arise where there is an inflammation of the body tissue which can be a local inflammatory response or a systemic inflammation. For example, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound can be used to treat or prevent pain associated with inflammatory diseases including, but not limited to, organ transplant rejection; reoxygenation injury resulting from organ transplantation (see Grupp et al., “Protection against Hypoxia-reoxygenation in the Absence of Poly (ADP-ribose) Synthetase in Isolated Working Hearts,” J. Mol. Cell Cardiol. 31:297-303 (1999)) including, but not limited to, transplantation of the heart, lung, liver, or kidney; chronic inflammatory diseases of the joints, including arthritis, rheumatoid arthritis, osteoarthritis and bone diseases associated with increased bone resorption; inflammatory bowel diseases, such as ileitis, ulcerative colitis, Barrett's syndrome, and Crohn's disease; inflammatory lung diseases, such as asthma, adult respiratory distress syndrome, and chronic obstructive airway disease; inflammatory diseases of the eye, including corneal dystrophy, trachoma, onchocerciasis, uveitis, sympathetic ophthalmitis and endophthalmitis; chronic inflammatory disease of the gum, including gingivitis and periodontitis; tuberculosis; leprosy; inflammatory diseases of the kidney, including uremic complications, glomerulonephritis and nephrosis; inflammatory disease of the skin, including sclerodermatitis, psoriasis and eczema; inflammatory diseases of the central nervous system, including chronic demyelinating diseases of the nervous system, multiple sclerosis, AIDS-related neurodegeneration and Alzheimer's disease, infectious meningitis, encephalomyelitis, Parkinson's disease, Huntington's disease, amyotrophic lateral sclerosis and viral or autoimmune encephalitis; autoimmune diseases, including Type I and Type II diabetes mellitus; diabetic complications, including, but not limited to, diabetic cataract, glaucoma, retinopathy, nephropathy (such as microalbuminuria and progressive diabetic nephropathy), gangrene of the feet, atherosclerotic coronary arterial disease, peripheral arterial disease, nonketotic hyperglycemic-hyperosmolar coma, foot ulcers, joint problems, and a skin or mucous membrane complication (such as an infection, a shin spot, a candidal infection or necrobiosis lipoidica diabeticorum), immune-complex vasculitis, and systemic lupus erythematosus (SLE); inflammatory disease of the heart, such as cardiomyopathy, ischemic heart disease hypercholesterolemia, and artherosclerosis; as well as various other diseases that can have significant inflammatory components, including preeclampsia, chronic liver failure, brain and spinal cord trauma, and cancer. An Azetidine-Substituted Quinoxaline-Type Piperidine Compound can also be used to treat or prevent pain associated with inflammatory disease that can, for example, be a systemic inflammation of the body, exemplified by gram-positive or gram negative shock, hemorrhagic or anaphylactic shock, or shock induced by cancer chemotherapy in response to pro-inflammatory cytokines, e.g., shock associated with pro-inflammatory cytokines. Such shock can be induced, e.g., by a chemotherapeutic agent that is administered as a treatment for cancer.

The Azetidine-Substituted Quinoxaline-Type Piperidine Compounds can also be used to treat or prevent pain associated with nerve injury (i.e., neuropathic pain). Chronic neuropathic pain is a heterogenous disease state with an unclear etiology. In chronic neuropathic pain, the pain can be mediated by multiple mechanisms. This type of pain generally arises from injury to the peripheral or central nervous tissue. The syndromes include pain associated with spinal cord injury, multiple sclerosis, post-herpetic neuralgia, trigeminal neuralgia, phantom pain, causalgia, and reflex sympathetic dystrophy and lower back pain. The chronic pain is different from acute pain in that chronic neuropathic pain patients suffer the abnormal pain sensations that can be described as spontaneous pain, continuous superficial burning and/or deep aching pain. The pain can be evoked by heat-, cold-, and mechano-hyperalgesia, or by heat-, cold-, or mechano-allodynia.

Chronic neuropathic pain can be caused by injury or infection of peripheral sensory nerves. It includes, but is not limited to, pain from peripheral nerve trauma, herpes virus infection, diabetes mellitus, causalgia, plexus avulsion, neuroma, limb amputation, and vasculitis. Neuropathic pain can also be caused by nerve damage from chronic alcoholism, human immunodeficiency virus infection, hypothyroidism, uremia, or vitamin deficiencies. Stroke (spinal or brain) and spinal cord injury can also induce neuropathic pain. Cancer-related neuropathic pain results from tumor growth compression of adjacent nerves, brain, or spinal cord. In addition, cancer treatments, including chemotherapy and radiation therapy, can cause nerve injury. Neuropathic pain includes but is not limited to pain caused by nerve injury such as, for example, the pain from which diabetics suffer.

The Azetidine-Substituted Quinoxaline-Type Piperidine Compounds can be used to treat or prevent a migraine including, but not limited to, migraine without aura (“common migraine”), migraine with aura (“classic migraine”), migraine without headache, basilar migraine, familial hemiplegic migraine, migrainous infarction, and migraine with prolonged aura.

According to the disclosure, some of the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds are agonists at the ORL-1 receptor, some of the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds are partial agonists at the ORL-1 receptor, and some of the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds are antagonists at the ORL-1 receptor. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is an agonist at the ORL-1 receptor and an agonist at a μ, κ and/or δ opioid receptor, particularly at a μ opioid receptor. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is a partial agonist at the ORL-1 receptor and an agonist at a μ, κ and/or δ opioid receptor, particularly at a μ opioid receptor. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is an antagonist at the ORL-1 receptor and an agonist at a μ, κ and/or δ opioid receptor, particularly at a μ opioid receptor. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is an agonist at the ORL-1 receptor and an antagonist at a μ, κ and/or δ opioid receptor, particularly at a μ opioid receptor. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is a partial agonist at the ORL-1 receptor and an antagonist at a μ, κ and/or δ opioid receptor, particularly at a μ opioid receptor. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is an antagonist at the ORL-1 receptor and an antagonist at a μ, κ and/or δ opioid receptor, particularly at a μ opioid receptor.

The disclosure also provides methods for inhibiting ORL-1 receptor function in a cell, comprising contacting a cell capable of expressing the ORL-1 receptor with an amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound effective to inhibit ORL-1 receptor function in the cell. This method can be adapted for use in vitro as part of an assay to select compounds that can be useful for treating or preventing a Condition in an animal. Alternatively, this method can be adapted for use in vivo, (i.e., in an animal such as a human) by contacting a cell in the animal with an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound. In one embodiment, the method is useful for treating or preventing pain in an animal in need of such treatment or prevention. In another embodiment, the method is useful for treating or preventing a memory disorder, obesity, constipation, depression, dementia, or Parkinsonism in an animal in need of such treatment or prevention.

The disclosure also relates to methods for activating ORL-1 receptor function in a cell, comprising contacting a cell capable of expressing the ORL-1 receptor with an amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound effective to activate ORL-1 receptor function in the cell. This method can be adapted for use in vitro as part of an assay to select compounds useful for treating or preventing, pain, anxiety, cough, diarrhea, high blood pressure, epilepsy, anorexia/cachexia, urinary incontinence, or drug abuse. Alternatively, the method can be adapted for use in vivo (i.e., in an animal such as a human), by contacting a cell in the animal with an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound. In one embodiment, the method is useful for treating or preventing pain in an animal in need of such treatment or prevention. In another embodiment, the method is useful for treating or preventing anxiety, cough, diarrhea, high blood pressure, epilepsy, anorexia/chachexia, urinary incontinence, or drug abuse in an animal in need of such treatment or prevention.

Examples of tissue comprising cells capable of expressing the ORL-1 receptor include but are not limited to brain, spinal cord, vas deferens, and gastrointestinal tract tissue. Methods for assaying cells that express the ORL-1 receptor are known in the art; for example, see Shimohigashi et al., “Sensitivity of Opioid Receptor-like Receptor ORL1 for Chemical Modification on Nociceptin, a Naturally Occurring Nociceptive Peptide,” J. Biol. Chem. 271(39):23642-23645 (1996); Narita et al., “Identification of the G-protein Coupled ORL1 Receptor in the Mouse Spinal Cord by [³⁵S]-GTPγS Binding and Immunohistochemistry,” Brit. J. Pharmacol. 128:1300-1306 (1999); Milligan, “Principles: Extending the Utility of [³⁵S]GTPγS Binding Assays,” TIPS 24(2):87-90 (2003); and Lazareno, “Measurement of Agonist-stimulated [³⁵S]GTPγS Binding to Cell Membranes,” Methods in Molecular Biology 106:231-245 (1999).

4.5 THERAPEUTIC/PROPHYLACTIC ADMINISTRATION AND COMPOSITIONS OF THE DISCLOSURE

Due to their activity, the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds are advantageously useful in human and veterinary medicine. As described above, the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds are useful for treating or preventing a Condition in an animal in need thereof. The Azetidine-Substituted Quinoxaline-Type Piperidine Compounds of the disclosure can be administered to any animal requiring modulation of the opioid and/or ORL-1 receptors.

When administered to an animal, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound can be administered as a component of a composition that comprises a pharmaceutically acceptable carrier or excipient. The compositions, which comprise an Azetidine-Substituted Quinoxaline-Type Piperidine Compound, can be administered orally. An Azetidine-Substituted Quinoxaline-Type Piperidine Compound can also be administered by any other convenient route, for example, by infusion or bolus injection, by absorption through epithelial or mucocutaneous linings (e.g., oral, rectal, and intestinal mucosa, etc.) and can be administered together with a second therapeutically active agent. Administration can be systemic or local. Various delivery systems are known, e.g., encapsulation in liposomes, microparticles, microcapsules, multiparticulates, capsules, etc., and can be used to administer an Azetidine-Substituted Quinoxaline-Type Piperidine Compound.

Methods of administration include, but are not limited to, intradermal, intramuscular, intraperitoneal, parenteral, intravenous, subcutaneous, intranasal, epidural, oral, sublingual, intracerebral, intravaginal, transdermal, rectal, by inhalation, or topical, particularly to the ears, nose, eyes, or skin. The method of administration is left to the discretion of the practitioner. In most instances, administration will result in the release of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound into the bloodstream.

In specific embodiments, it can be desirable to administer an Azetidine-Substituted Quinoxaline-Type Piperidine Compound locally. This can be achieved, for example and not by way of limitation, by local infusion during surgery, topical application, e.g., in conjunction with a wound dressing after surgery, by injection, by means of a catheter, by means of a suppository or enema, or by means of an implant, said implant being of a porous, non-porous, or gelatinous material, including membranes, such as sialastic membranes, or fibers.

In certain embodiments, it can be desirable to introduce an Azetidine-Substituted Quinoxaline-Type Piperidine Compound into the central nervous system or gastrointestinal tract by any suitable route, including intraventricular, intrathecal, and epidural injection, and enema. Intraventricular injection can be facilitated by an intraventricular catheter, for example, attached to a reservoir, such as an Ommaya reservoir.

Pulmonary administration can also be employed, e.g., by use of an inhaler or nebulizer, and formulation with an aerosolizing agent, or via perfusion in a fluorocarbon or synthetic pulmonary surfactant. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound can be formulated as a suppository, with traditional binders and excipients such as triglycerides.

When an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure is incorporated for parenteral administration by injection (e.g., continuous infusion or bolus injection), the formulation for parenteral administration can be in the form of a suspension, solution, emulsion in an oily or aqueous vehicle, and such formulations can further comprise pharmaceutically necessary additives such as one or more stabilizing agents, suspending agents, dispersing agents, and the like. An Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure can also be in the form of a powder for reconstitution as an injectable formulation.

In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound can be delivered in a vesicle, in particular a liposome (see Langer, “New Methods of Drug Delivery,” Science 249:1527-1533 (1990); and Treat et al., “Liposome Encapsulated Doxorubicin Preliminary Results of Phase I and Phase II Trials,” pp. 317-327 and 353-365 in Liposomes in the Therapy of Infectious Disease and Cancer (1989)).

In yet another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound can be delivered in a controlled-release system or sustained-release system (see, e.g., Goodson, “Dental Applications,” in Medical Applications of Controlled Release, Vol. 2, Applications and Evaluation, Langer and Wise, eds., CRC Press, Chapter 6, pp. 115-138 (1984), hereafter “Goodson”). Other controlled- or sustained-release systems discussed in the review by Langer, Science 249:1527-1533 (1990) can be used. In one embodiment, a pump can be used (Langer, Science 249:1527-1533 (1990); Sefton, “Implantable Pumps,” in CRC Crit. Rev. Biomed Eng. 14(3):201-240 (1987); Buchwald et al., “Long-term, Continuous Intravenous Heparin Administration by an Implantable Infusion Pump in Ambulatory Patients with Recurrent Venous Thrombosis,” Surgery 88:507-516 (1980); and Saudek et al., “A Preliminary Trial of the Programmable Implantable Medication System for Insulin Delivery,” New Engl. J. Med. 321:574-579 (1989)). In another embodiment, polymeric materials can be used (see Goodson; Smolen et al., “Drug Product Design and Performance,” Controlled Drug Bioavailability Vol. 1, John Wiley & Sons, New York (1984); Langer et al., “Chemical and Physical Structure of Polymers as Carriers for Controlled Release of Bioactive Agents: A Review,” J. Macromol. Sci. Rev. Macromol. Chem. C23(1):61-126 (1983); Levy et al., “Inhibition of Calcification of Bioprosthetic Heart Valves by Local Controlled-Release Diphosphonate,” Science 228:190-192 (1985); During et al., “Controlled Release of Dopamine from a Polymeric Brain Implant: In Vivo Characterization,” Ann. Neurol. 25:351-356 (1989); and Howard et al., “Intracerebral drug delivery in rats with lesion-induced memory deficits,” J. Neurosurg. 71:105-112 (1989)). In yet another embodiment, a controlled- or sustained-release system can be placed in proximity of a target of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound, e.g., the spinal column, brain, or gastrointestinal tract, thus requiring only a fraction of the systemic dose.

The compositions can optionally comprise a suitable amount of a pharmaceutically acceptable excipient so as to provide the form for proper administration to the animal. Such a pharmaceutical excipient can be a diluent, suspending agent, solubilizer, binder, disintegrant, preservative, coloring agent, lubricant, and the like. The pharmaceutical excipient can be a liquid, such as water or an oil, including those of petroleum, animal, vegetable, or synthetic origin, such as peanut oil, soybean oil, mineral oil, sesame oil, and the like. The pharmaceutical excipient can be saline, gum acacia, gelatin, starch paste, talc, keratin, colloidal silica, urea, and the like. In addition, auxiliary, stabilizing, thickening, lubricating, and coloring agents can be used. In one embodiment, the pharmaceutically acceptable excipient is sterile when administered to an animal. Water is a particularly useful excipient when an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is administered intravenously. Saline solutions and aqueous dextrose and glycerol solutions can also be employed as liquid excipients, particularly for injectable solutions. Suitable pharmaceutical excipients also include starch, glucose, lactose, sucrose, gelatin, malt, rice, flour, chalk, silica gel, sodium stearate, glycerol monostearate, talc, sodium chloride, dried skim milk, glycerol, propylene glycol, water, ethanol, and the like. The compositions, if desired, can also contain minor amounts of wetting or emulsifying agents, or pH buffering agents. Specific examples of pharmaceutically acceptable carriers and excipients that can be used to formulate oral dosage forms are described in the Handbook of Pharmaceutical Excipients, (Amer. Pharmaceutical Ass'n, Washington, D.C., 1986), incorporated herein by reference.

The compositions can take the form of solutions, suspensions, emulsions, tablets, pills, pellets, capsules, capsules containing liquids, powders, sustained-release formulations, suppositories, emulsions, aerosols, sprays, suspensions, or any other form suitable for use. In one embodiment, the composition is in the form of a capsule (see, e.g., U.S. Pat. No. 5,698,155). Other examples of suitable pharmaceutical excipients are described by Radebough et al., “Preformulation,” pp. 1447-1676 in Remington's Pharmaceutical Sciences Vol. 2 (Gennaro, ed., 19^(th) Ed., Mack Publishing, Easton, Pa., 1995), incorporated herein by reference.

In one embodiment, the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds are formulated in accordance with routine procedures as a composition adapted for oral administration to human beings. An Azetidine-Substituted Quinoxaline-Type Piperidine Compound to be orally delivered can be in the form of tablets, capsules, gelcaps, caplets, lozenges, aqueous or oily solutions, suspensions, granules, powders, emulsions, syrups, or elixirs, for example. When an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is incorporated into oral tablets, such tablets can be compressed, tablet triturates, enteric-coated, sugar-coated, film-coated, multiply compressed or multiply layered. Techniques and compositions for making solid oral dosage forms are described in Pharmaceutical Dosage Forms: Tablets (Lieberman et al., eds., 2^(nd) Ed., Marcel Dekker, Inc., 1989 & 1990). Techniques and compositions for making tablets (compressed and molded), capsules (hard and soft gelatin) and pills are also described by King, “Tablets, Capsules, and Pills,” pp. 1553-1593 in Remington's Pharmaceutical Sciences (Osol, ed., 16^(th) Ed., Mack Publishing, Easton, Pa., 1980).

Liquid oral dosage forms include aqueous and nonaqueous solutions, emulsions, suspensions, and solutions and/or suspensions reconstituted from non-effervescent granules, optionally containing one or more suitable solvents, preservatives, emulsifying agents, suspending agents, diluents, sweeteners, coloring agents, flavoring agents, and the like. Techniques and composition for making liquid oral dosage forms are described in Pharmaceutical Dosage Forms: Disperse Systems (Lieberman et al., eds., 2^(nd) Ed., Marcel Dekker, Inc., 1996 & 1998).

When an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is to be injected parenterally, it can be, e.g., in the form of an isotonic sterile solution. Alternatively, when an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is to be inhaled, it can be formulated into a dry aerosol or can be formulated into an aqueous or partially aqueous solution.

An orally administered Azetidine-Substituted Quinoxaline-Type Piperidine Compound can contain one or more agents, for example, sweetening agents such as fructose, aspartame or saccharin; flavoring agents such as peppermint, oil of wintergreen, or cherry; coloring agents; and preserving agents, to provide a pharmaceutically palatable preparation. Moreover, where in tablet or pill form, the compositions can be coated to delay disintegration and absorption in the gastrointestinal tract thereby providing a sustained action over an extended period of time. Selectively permeable membranes surrounding an osmotically active driving compound are also suitable for orally administered compositions. In these latter platforms, fluid from the environment surrounding the capsule is imbibed by the driving compound, which swells to displace the agent or agent composition through an aperture. These delivery platforms can provide an essentially zero order delivery profile as opposed to the spiked profiles of immediate release formulations. A time-delay material such as glycerol monostearate or glycerol stearate can also be used. Oral compositions can include standard excipients such as mannitol, lactose, starch, magnesium stearate, sodium saccharin, cellulose, and magnesium carbonate. In one embodiment, the excipients are of pharmaceutical grade.

In another embodiment, the Azetidine-Substituted Quinoxaline-Type Piperidine Compounds can be formulated for intravenous administration. In certain embodiments, compositions for intravenous administration comprise sterile isotonic aqueous buffer. Where necessary, the compositions can also include a solubilizing agent. An Azetidine-Substituted Quinoxaline-Type Piperidine Compound for intravenous administration can optionally include a local anesthetic such as benzocaine or prilocaine to lessen pain at the site of the injection. Generally, the ingredients are supplied either separately or mixed together in unit dosage form, for example, as a dry lyophilized powder or water free concentrate in a hermetically sealed container such as an ampule or sachette indicating the quantity of active agent. Where an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is to be administered by infusion, it can be dispensed, for example, with an infusion bottle containing sterile pharmaceutical grade water or saline. Where an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is administered by injection, an ampule of sterile water for injection or saline can be provided so that the ingredients can be mixed prior to administration.

An Azetidine-Substituted Quinoxaline-Type Piperidine Compound can be administered by controlled-release or sustained-release means or by delivery devices that are known to those in the art. Examples include, but are not limited to, those described in U.S. Pat. Nos. 3,845,770, 3,916,899, 3,536,809, 3,598,123, 4,008,719, 5,674,533, 5,059,595, 5,591,767, 5,120,548, 5,073,543, 5,639,476, 5,354,556, and 5,733,566, each of which is incorporated herein by reference. Such dosage forms can be used to provide controlled- or sustained-release of one or more active ingredients using, for example, hydropropylmethyl cellulose, ethylcellulose, other polymer matrices, gels, permeable membranes, osmotic systems, multilayer coatings, microparticles, multiparticulates, liposomes, microspheres, or a combination thereof to provide the desired release profile in varying proportions. Suitable controlled- or sustained-release formulations known to those in the art, including those described herein, can be readily selected for use with the active ingredients of the disclosure. The disclosure thus encompasses single unit dosage forms suitable for oral administration such as, but not limited to, tablets, capsules, gelcaps, and caplets that are adapted for controlled- or sustained-release.

Controlled- or sustained-release pharmaceutical compositions can have a common goal of improving drug therapy over that achieved by their non-controlled or non-sustained-release counterparts. In one embodiment, a controlled- or sustained-release composition comprises a minimal amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound to treat or prevent the Condition or a symptom thereof in a minimum amount of time. Advantages of controlled- or sustained-release compositions include extended activity of the drug, reduced dosage frequency, and increased compliance. In addition, controlled- or sustained-release compositions can favorably affect the time of onset of action or other characteristics, such as blood levels of the Azetidine-Substituted Quinoxaline-Type Piperidine Compound, and can thus reduce the occurrence of adverse side effects.

Controlled- or sustained-release compositions can initially release an amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound that promptly produces the desired therapeutic or prophylactic effect, and gradually and continually release other amounts of the Azetidine-Substituted Quinoxaline-Type Piperidine Compound to maintain this level of therapeutic or prophylactic effect over an extended period of time. To maintain a constant level of the Azetidine-Substituted Quinoxaline-Type Piperidine Compound in the body, the Azetidine-Substituted Quinoxaline-Type Piperidine Compound can be released from the dosage form at a rate that will replace the amount of Azetidine-Substituted Quinoxaline-Type Piperidine Compound being metabolized and excreted from the body. Controlled- or sustained-release of an active ingredient can be stimulated by various conditions, including but not limited to, changes in pH, changes in temperature, concentration or availability of enzymes, concentration or availability of water, or other physiological conditions or compounds.

The amount of the Azetidine-Substituted Quinoxaline-Type Piperidine Compound that is effective for the treatment or prevention of a Condition can be determined by standard clinical techniques. In addition, in vitro and/or in vivo assays can optionally be employed to help identify optimal dosage ranges. The precise dose to be employed will also depend on, e.g., the route of administration and the seriousness of the Condition, and can be decided according to the judgment of a practitioner and/or each animal's circumstances. In other examples thereof, variations will necessarily occur depending upon the weight and physical condition (e.g., hepatic and renal function) of the animal being treated, the affliction to be treated, the severity of the symptoms, the frequency of the dosage interval, the presence of any deleterious side-effects, and the particular compound utilized, among other things.

Suitable effective dosage amounts, however, range from about 0.01 mg/kg of body weight to about 3000 mg/kg of body weight of the animal per day, although they are, in certain embodiments, from about 0.01 mg/kg of body weight to about 2500 mg/kg of body weight of the animal per day or from about 0.01 mg/kg of body weight to about 1000 mg/kg of body weight of the animal per day. In another embodiment, the effective dosage amount is about 100 mg/kg of body weight of the animal per day or less. In another embodiment, the effective dosage amount ranges from about 0.01 mg/kg of body weight to about 100 mg/kg of body weight of the animal per day of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound, in another embodiment, about 0.02 mg/kg of body weight to about 50 mg/kg of body weight of the animal per day, and in another embodiment, about 0.025 mg/kg of body weight to about 20 mg/kg of body weight of the animal per day.

Administration can be as a single dose or as a divided dose. In one embodiment, an effective dosage amount is administered about every 24 hr until the Condition is abated. In another embodiment, an effective dosage amount is administered about every 12 hr until the Condition is abated. In another embodiment, an effective dosage amount is administered about every 8 hr until the Condition is abated. In another embodiment, an effective dosage amount is administered about every 6 hr until the Condition is abated. In another embodiment, an effective dosage amount is administered about every 4 hr until the Condition is abated. The effective dosage amounts described herein refer to total amounts administered; that is, if more than one Azetidine-Substituted Quinoxaline-Type Piperidine Compound is administered, the effective dosage amounts correspond to the total amount administered.

Where a cell capable of expressing the ORL-1 receptor, the μ-opioid receptor, the κ-opioid receptor and/or the δ-opioid receptor is contacted with an Azetidine-Substituted Quinoxaline-Type Piperidine Compound in vitro, the amount effective for inhibiting or activating that receptor function in a cell will, in certain embodiments, range from about 10⁻¹² mol/L to about 10⁻⁴ mol/L, in one embodiment, from about 10⁻¹² mol/L to about 10⁻⁵ mol/L, in another embodiment, from about 10⁻¹² mol/L to about 10⁻⁶ mol/L, and in another embodiment, from about 10⁻¹² mol/L to about 10⁻⁹ mol/L of a solution or suspension of a pharmaceutically acceptable carrier or excipient. In one embodiment, the volume of solution or suspension comprising the Azetidine-Substituted Quinoxaline-Type Piperidine Compound will be from about 0.01 μL to about 1 mL. In another embodiment, the volume of solution or suspension will be about 200 μL.

In one embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a binding affinity (K_(i)) for the human ORL-1 receptor of about 1000 nM or less in one embodiment, or about 500 nM or less in another embodiment, about 100 nM or less in another embodiment, about 50 nM or less in another embodiment, or about 20 nM or less in another embodiment, or about 5 nM or less in another embodiment. The binding affinity K_(i) can be measured in ways known to the art, e.g., by an assay utilizing membranes from recombinant HEK-293 cells expressing the ORL-1 receptor.

In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a Ki (nM) of about 300 or less for binding to ORL-1 receptors. In one embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 100 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 35 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 20 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 15 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 10 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 4 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 1 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 0.4 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a (nM) of about 0.1 or less.

ORL-1 GTP EC₅₀ is the concentration of a compound providing 50% of the maximal response for the compound at an ORL-1 receptor. In one embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 5000 or less to stimulate ORL-1 receptor function. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has an ORL-1 GTP EC₅₀ (nM) of about 1000 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has an ORL-1 GTP EC₅₀ (nM) of about 100 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has an ORL-1 GTP EC₅₀ (nM) of about 80 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has an ORL-1 GTP EC₅₀ (nM) of about 50 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has an ORL-1 GTP EC₅₀ (nM) of about 35 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has an ORL-1 GTP EC₅₀ (nM) of about 15 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 10 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 4 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 1 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 0.4 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 0.1 or less.

ORL-1 GTP Emax (%) is the maximal effect elicited by a compound relative to the effect elicited by nociceptin, a standard ORL-1 agonist. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure acting as an agonist has an ORL-1 GTP Emax (%) of about 50% or greater. In one embodiment, agonist Azetidine-Substituted Quinoxaline-Type Piperidine Compounds has an ORL-1 GTP Emax (%) of about 75% or greater. In another embodiment, agonist Azetidine-Substituted Quinoxaline-Type Piperidine Compounds has an ORL-1 GTP Emax (%) of about 85% or greater. In another embodiment, agonist Azetidine-Substituted Quinoxaline-Type Piperidine Compounds has an ORL-1 GTP Emax (%) of about 95% or greater. In another embodiment, agonist Azetidine-Substituted Quinoxaline-Type Piperidine Compounds has an ORL-1 GTP Emax (%) of about 100% or greater. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure acting as a partial agonist has an ORL-1 GTP Emax (%) of less than about 10%. In one embodiment, partial agonist Azetidine-Substituted Quinoxaline-Type Piperidine Compounds has an ORL-1 GTP Emax (%) of less than about 20%. In another embodiment, partial agonist Azetidine-Substituted Quinoxaline-Type Piperidine Compounds has an ORL-1 GTP Emax (%) of less than about 30%. In another embodiment, partial agonist Azetidine-Substituted Quinoxaline-Type Piperidine Compounds has an ORL-1 GTP Emax (%) of less than about 40%. In another embodiment, partial agonist Azetidine-Substituted Quinoxaline-Type Piperidine Compounds has an ORL-1 GTP Emax (%) of less than about 50%.

In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a binding affinity (K_(i)) for the human μ-opioid receptor of about 1000 nM or less in one embodiment, or about 500 nM or less in another embodiment, about 100 nM or less in another embodiment, about 50 nM or less in another embodiment, or about 20 nM or less in another embodiment, or about 5 nM or less in another embodiment.

In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a K_(i) (nM) for the human μ-opioid receptor of about 3000 or less for binding to a human μ-opioid receptor, or about 1000 or less, or about 650 or less, or about 525 or less, or about 250 or less, or about 100 or less, or about 10 or less, or about 1 or less. In one embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has substantially no activity.

μ GTP EC₅₀ is the concentration of a compound providing 50% of the maximal response for the compound at a human μ-opioid receptor. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a μ GTP EC₅₀ (nM) of about 20,000 or less to stimulate human μ-opioid receptor function, or about 10,000 or less. In other embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a μ GTP EC₅₀ (nM) of about 5000 or less to stimulate human μ-opioid receptor function, or about 4100 or less, or about 3100 or less, or about 2000 or less, or about 1000 or less, or about 100 or less, or about 10 or less, or about 1 or less, or about 0.4 or less.

μ GTP Emax (%) is the maximal effect elicited by a compound relative to the effect elicited by DAMGO, a standard μ agonist. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a μ GTP Emax (%) of about 10% or greater, or about 20% or greater, or about 50% or greater, or about 65% or greater, or about 75% or greater, or about 88% or greater. In other embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a μ GTP Emax (%) of about 10% or less, or about 5% or less, or about 2% or less.

In one embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a K_(i) (nM) of about 20,000 or less for binding to a human κ-opioid receptor. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has substantially no activity. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound that bind to the human κ-opioid receptor has a K_(i) (nM) of about 10,000 or less, or about 5000 or less, or about 1000 or less, or about 500 or less, or about 300 or less, or about 100 or less, or about 50 or less, or about 20 or less, or about 15 or less.

κ GTP EC₅₀ is the concentration of a compound providing 50% of the maximal response for the compound at a human κ-opioid receptor. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a κ GTP EC₅₀ (nM) of about 20,000 or less to stimulate human κ-opioid receptor function, or about 10,000 or less, or about 5000 or less, or about 2000 or less, or about 1500 or less, or about 800 or less, or about 500 or less, or about 300 or less, or about 100 or less, or about 50 or less, or about 25 or less.

κ GTP Emax (%) is the maximal effect elicited by a compound relative to the effect elicited by U69,593. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a κ GTP Emax (%) of about 10% or greater, or about 15% or greater, or about 30% or greater, or about 40% or greater, or about 45% or greater, or about 75% or greater, or about 90% or greater. In other embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a κ GTP Emax (%) of about 10% or less, or about 5% or less, or about 2% or less.

In one embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a K_(i) (nM) of about 20,000 or less for binding to a human δ-opioid receptor. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has substantially no activity. In other embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound that binds to the human δ-opioid receptor has a K_(i) (nM) of about 10,000 or less, or about 9000 or less, or about 7500 or less, or about 6500 or less, or about 5000 or less, or about 3000 or less, or about 2500 or less, or about 1000 or less, or about 500 or less, or about 350 or less, or about 250 or less, or about 100 or less.

δ GTP EC₅₀ is the concentration of a compound providing 50% of the maximal response for the compound at a human δ-opioid receptor. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a δ GTP EC₅₀ (nM) of about 20,000 or less to stimulate human δ-opioid receptor function, or about 10,000 or less, or about 1000 or less, or about 100 or less, or about 90 or less, or about 50 or less, or about 25 or less or less.

δ GTP Emax (%) is the maximal effect elicited by a compound relative to the effect elicited by met-enkephalin. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a δ GTP Emax (%) of about 10% or greater, or about 30% or greater, or about 50% or greater, or about 75% or greater, or about 90% or greater, or about 100% or greater. In other embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a δ GTP Emax (%) of about 10% or less, or about 5% or less, or about 2% or less.

The Azetidine-Substituted Quinoxaline-Type Piperidine Compounds can be assayed in vitro or in vivo for the desired therapeutic or prophylactic activity prior to use in humans Animal model systems can be used to demonstrate safety and efficacy.

The methods for treating or preventing a Condition in an animal in need thereof can further comprise co-administering to the animal being administered an Azetidine-Substituted Quinoxaline-Type Piperidine Compound (i.e., a first therapeutic agent) a second therapeutic agent. In one embodiment, the second therapeutic agent is administered in an effective amount.

An effective amount of the second therapeutic agent will be known to those skilled the art depending on the agent. However, it is well within the skilled artisan's purview to determine the second therapeutic agent's optimal effective-amount range. An Azetidine-Substituted Quinoxaline-Type Piperidine Compound and the second therapeutic agent combined can act either additively or synergistically to treat the same Condition, or they may act independently of each other such that the Azetidine-Substituted Quinoxaline-Type Piperidine Compound treats or prevents a first Condition and the second therapeutic agent treats or prevents a second disorder, which can be the same as the first Condition or another disorder. In one embodiment of the disclosure, where a second therapeutic agent is administered to an animal for treatment of a Condition (e.g., pain), the minimal effective amount of the Azetidine-Substituted Quinoxaline-Type Piperidine Compound will be less than its minimal effective amount would be where the second therapeutic agent is not administered. In this embodiment, the Azetidine-Substituted Quinoxaline-Type Piperidine Compound and the second therapeutic agent can act synergistically to treat or prevent a Condition. In one embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is administered concurrently with a second therapeutic agent as a single composition comprising an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound and an effective amount of the second therapeutic agent. Alternatively, a composition comprising an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound and a second composition comprising an effective amount of the second therapeutic agent are concurrently administered. In another embodiment, an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound is administered prior or subsequent to administration of an effective amount of the second therapeutic agent. In this embodiment, the Azetidine-Substituted Quinoxaline-Type Piperidine Compound is administered while the second therapeutic agent exerts its therapeutic effect, or the second therapeutic agent is administered while the Azetidine-Substituted Quinoxaline-Type Piperidine Compound exerts its therapeutic effect for treating or preventing a Condition.

The second therapeutic agent can be, but is not limited to, an opioid agonist, a non-opioid analgesic, a non-steroidal anti-inflammatory agent, an antimigraine agent, a Cox-II inhibitor, a 5-lipoxygenase inhibitor, an anti-emetic, a β-adrenergic blocker, an anticonvulsant, an antidepressant, a Ca²⁺-channel blocker, an anti-cancer agent, an agent for treating or preventing UI, an agent for treating or preventing anxiety, an agent for treating or preventing a memory disorder, an agent for treating or preventing obesity, an agent for treating or preventing constipation, an agent for treating or preventing cough, an agent for treating or preventing diarrhea, an agent for treating or preventing high blood pressure, an agent for treating or preventing epilepsy, an agent for treating or preventing anorexia/cachexia, an agent for treating or preventing drug abuse, an agent for treating or preventing an ulcer, an agent for treating or preventing IBD, an agent for treating or preventing IBS, an agent for treating or preventing addictive disorder, an agent for treating or preventing Parkinson's disease and parkinsonism, an agent for treating or preventing a stroke, an agent for treating or preventing a seizure, an agent for treating or preventing a pruritic condition, an agent for treating or preventing psychosis, an agent for treating or preventing Huntington's chorea, an agent for treating or preventing ALS, an agent for treating or preventing a cognitive disorder, an agent for treating or preventing a migraine, an agent for inhibiting vomiting, an agent for treating or preventing dyskinesia, an agent for treating or preventing depression, or any mixture thereof.

Examples of useful opioid agonists include, but are not limited to, alfentanil, allylprodine, alphaprodine, anileridine, benzylmorphine, bezitramide, buprenorphine, butorphanol, clonitazene, codeine, desomorphine, dextromoramide, dezocine, diampromide, diamorphone, dihydrocodeine, dihydromorphine, dimenoxadol, dimepheptanol, dimethylthiambutene, dioxaphetyl butyrate, dipipanone, eptazocine, ethoheptazine, ethylmethylthiambutene, ethylmorphine, etonitazene, fentanyl, heroin, hydrocodone, hydromorphone, hydroxypethidine, isomethadone, ketobemidone, levorphanol, levophenacylmorphan, lofentanil, meperidine, meptazinol, metazocine, methadone, metopon, morphine, myrophine, nalbuphine, narceine, nicomorphine, norlevorphanol, normethadone, nalorphine, normorphine, norpipanone, opium, oxycodone, oxymorphone, papaveretum, pentazocine, phenadoxone, phenomorphan, phenazocine, phenoperidine, piminodine, piritramide, proheptazine, promedol, properidine, propiram, propoxyphene, sufentanil, tilidine, tramadol, pharmaceutically acceptable derivatives thereof, or any mixture thereof.

In certain embodiments, the opioid agonist is codeine, hydromorphone, hydrocodone, oxycodone, dihydrocodeine, dihydromorphine, morphine, tramadol, oxymorphone, pharmaceutically acceptable derivatives thereof, or any mixture thereof.

Examples of useful non-opioid analgesics include, but are not limited to, non-steroidal anti-inflammatory agents, such as aspirin, ibuprofen, diclofenac, naproxen, benoxaprofen, flurbiprofen, fenoprofen, flubufen, ketoprofen, indoprofen, piroprofen, carprofen, oxaprozin, pramoprofen, muroprofen, trioxaprofen, suprofen, aminoprofen, tiaprofenic acid, fluprofen, bucloxic acid, indomethacin, sulindac, tolmetin, zomepirac, tiopinac, zidometacin, acemetacin, fentiazac, clidanac, oxpinac, mefenamic acid, meclofenamic acid, flufenamic acid, niflumic acid, tolfenamic acid, diflurisal, flufenisal, piroxicam, sudoxicam, isoxicam, a pharmaceutically acceptable derivative thereof, or any mixture thereof. Other suitable non-opioid analgesics include the following, non-limiting, chemical classes of analgesic, antipyretic, nonsteroidal anti-inflammatory drugs; salicylic acid derivatives, including aspirin, sodium salicylate, choline magnesium trisalicylate, salsalate, diflunisal, salicylsalicylic acid, sulfasalazine, and olsalazin; para-aminophenol derivatives including acetaminophen and phenacetin; indole and indene acetic acids, including indomethacin, sulindac, and etodolac; heteroaryl acetic acids, including tolmetin, diclofenac, and ketorolac; anthranilic acids (fenamates), including mefenamic acid and meclofenamic acid; enolic acids, including oxicams (piroxicam, tenoxicam), and pyrazolidinediones (phenylbutazone, oxyphenthatrazone); alkanones, including nabumetone; a pharmaceutically acceptable derivative thereof; or any mixture thereof. For a more detailed description of the NSAIDs, see Insel, “Analgesic-Antipyretic and Anti-inflammatory Agents and Drugs Employed in the Treatment of Gout,” pp. 617-657 in Goodman & Gilman's The Pharmacological Basis of Therapeutics (Goodman et al., eds., 9^(th) Ed., McGraw-Hill, New York 1996), and Hanson, “Analgesic, Antipyretic and Anti-Inflammatory Drugs,” pp. 1196-1221 in Remington: The Science and Practice of Pharmacy Vol. II (Gennaro, ed., 19^(th) Ed., Mack Publishing, Easton, Pa., 1995), which are hereby incorporated by reference in their entireties.

Examples of useful Cox-II inhibitors and 5-lipoxygenase inhibitors, as well as combinations thereof, are described in U.S. Pat. No. 6,136,839, which is hereby incorporated by reference in its entirety. Examples of useful Cox-II inhibitors include, but are not limited to, celecoxib, DUP-697, flosulide, meloxicam, 6-MNA, L-745337, rofecoxib, nabumetone, nimesulide, NS-398, SC-5766, T-614, L-768277, GR-253035, JTE-522, RS-57067-000, SC-58125, SC-078, PD-138387, NS-398, flosulide, D-1367, SC-5766, PD-164387, etoricoxib, valdecoxib, parecoxib, a pharmaceutically acceptable derivative thereof, or any mixture thereof.

Examples of useful antimigraine agents include, but are not limited to, alpiropride, bromocriptine, dihydroergotamine, dolasetron, ergocornine, ergocorninine, ergocryptine, ergonovine, ergot, ergotamine, flumedroxone acetate, fonazine, ketanserin, lisuride, lomerizine, methylergonovine, methysergide, metoprolol, naratriptan, oxetorone, pizotyline, propranolol, risperidone, rizatriptan, sumatriptan, timolol, trazodone, zolmitriptan, a pharmaceutically acceptable derivative thereof, or any mixture thereof.

Examples of useful anticonvulsants include, but are not limited to, acetylpheneturide, albutoin, aloxidone, aminoglutethimide, 4-amino-3-hydroxybutyric acid, atrolactamide, beclamide, buramate, calcium bromide, carbamazepine, cinromide, clomethiazole, clonazepam, decimemide, diethadione, dimethadione, doxenitroin, eterobarb, ethadione, ethosuximide, ethotoin, felbamate, fluoresone, gabapentin, 5-hydroxytryptophan, lamotrigine, magnesium bromide, magnesium sulfate, mephenyloin, mephobarbital, metharbital, methetoin, methsuximide, 5-methyl-5-(3-phenanthryl)-hydantoin, 3-methyl-5-phenylhydantoin, narcobarbital, nimetazepam, nitrazepam, oxcarbazepine, paramethadione, phenacemide, phenetharbital, pheneturide, phenobarbital, phensuximide, phenylmethylbarbituric acid, phenyloin, phethenylate sodium, potassium bromide, pregabaline, primidone, progabide, sodium bromide, solanum, strontium bromide, suclofenide, sulthiame, tetrantoin, tiagabine, topiramate, trimethadione, valproic acid, valpromide, vigabatrin, zonisamide, a pharmaceutically acceptable derivative thereof, or any mixture thereof.

Examples of useful Ca²⁺-channel blockers include, but are not limited to, bepridil, clentiazem, diltiazem, fendiline, gallopamil, mibefradil, prenylamine, semotiadil, terodiline, verapamil, amlodipine, aranidipine, barnidipine, benidipine, cilnidipine, efonidipine, elgodipine, felodipine, isradipine, lacidipine, lercanidipine, manidipine, nicardipine, nifedipine, nilvadipine, nimodipine, nisoldipine, nitrendipine, cinnarizine, flunarizine, lidoflazine, lomerizine, bencyclane, etafenone, fantofarone, perhexyline, a pharmaceutically acceptable derivative thereof, or any mixture thereof.

Examples of useful therapeutic agents for treating or preventing UI include, but are not limited to, propantheline, imipramine, hyoscyamine, oxybutynin, dicyclomine, a pharmaceutically acceptable derivative thereof, or any mixture thereof.

Examples of useful therapeutic agents for treating or preventing anxiety include, but are not limited to, benzodiazepines, such as alprazolam, brotizolam, chlordiazepoxide, clobazam, clonazepam, clorazepate, demoxepam, diazepam, estazolam, flumazenil, flurazepam, halazepam, lorazepam, midazolam, nitrazepam, nordazepam, oxazepam, prazepam, quazepam, temazepam, and triazolam; non-benzodiazepine agents, such as buspirone, gepirone, ipsapirone, tiospirone, zolpicone, zolpidem, and zaleplon; tranquilizers, such as barbituates, e.g., amobarbital, aprobarbital, butabarbital, butalbital, mephobarbital, methohexital, pentobarbital, phenobarbital, secobarbital, and thiopental; propanediol carbamates, such as meprobamate and tybamate; a pharmaceutically acceptable derivative thereof; or any mixture thereof.

Examples of useful therapeutic agents for treating or preventing diarrhea include, but are not limited to, diphenoxylate, loperamide, a pharmaceutically acceptable derivative thereof, or any mixture thereof.

Examples of useful therapeutic agents for treating or preventing epilepsy include, but are not limited to, carbamazepine, ethosuximide, gabapentin, lamotrigine, phenobarbital, phenyloin, primidone, valproic acid, trimethadione, benzodiazepines, γ vinyl GABA, acetazolamide, felbamate, a pharmaceutically acceptable derivative thereof, or any mixture thereof.

Examples of useful therapeutic agents for treating or preventing drug abuse include, but are not limited to, methadone, desipramine, amantadine, fluoxetine, buprenorphine, an opiate agonist, 3-phenoxypyridine, levomethadyl acetate hydrochloride, serotonin antagonists, a pharmaceutically acceptable derivative thereof, or any mixture thereof.

Examples of non-steroidal anti-inflammatory agents, 5-lipoxygenase inhibitors, anti-emetics, β-adrenergic blockers, antidepressants, and anti-cancer agents are known in the art and can be selected by those skilled in the art. Examples of useful therapeutic agents for treating or preventing memory disorder, obesity, constipation, cough, high blood pressure, anorexia/cachexia, an ulcer, IBD, IBS, addictive disorder, Parkinson's disease and parkinsonism, a stroke, a seizure, a pruritic condition, psychosis, Huntington's chorea, ALS, a cognitive disorder, a migraine, dyskinesia, depression, and/or treating, preventing or inhibiting vomiting include those that are known in the art and can be selected by those skilled in the art.

A composition of the disclosure is prepared by a method comprising admixing an Azetidine-Substituted Quinoxaline-Type Piperidine Compound or a pharmaceutically acceptable derivative thereof with a pharmaceutically acceptable carrier or excipient. Admixing can be accomplished using methods known for admixing a compound (or derivative) and a pharmaceutically acceptable carrier or excipient. In one embodiment, the Azetidine-Substituted Quinoxaline-Type Piperidine Compound is present in the composition in an effective amount.

4.6 KITS

The disclosure further provides kits that can simplify the handling and administration of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound to an animal

A typical kit of the disclosure comprises a unit dosage form of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound. In one embodiment, the unit dosage form comprises a first container, which can be sterile, containing an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound and a pharmaceutically acceptable carrier or excipient. The kit can further comprise a label or printed instructions instructing the use of the Azetidine-Substituted Quinoxaline-Type Piperidine Compound to treat or prevent a Condition. The kit can further comprise a unit dosage form of a second therapeutic agent, for example, a second container containing an effective amount of the second therapeutic agent and a pharmaceutically acceptable carrier or excipient. In another embodiment, the kit comprises a container containing an effective amount of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound, an effective amount of a second therapeutic agent and a pharmaceutically acceptable carrier or excipient. Examples of second therapeutic agents include, but are not limited to, those listed above.

Kits of the disclosure can further comprise a device that is useful for administering the unit dosage forms. Examples of such a device include, but are not limited to, a syringe, a drip bag, a patch, an inhaler, and an enema bag.

The following examples are set forth to assist in understanding the invention and should not be construed as specifically limiting the invention described and claimed herein. Such variations of the invention, including the substitution of all equivalents now known or later developed, that would be within the purview of those skilled in the art, and changes in formulation or changes in experimental design, are to be considered to fall within the scope of the invention incorporated herein.

5. EXAMPLES

Certain Examples below relate to the synthesis of illustrative Azetidine-Substituted Quinoxaline-Type Piperidine Compounds.

5.1 Example 1 Synthesis of Azetidine-Substituted Quinoxaline-Type Piperidine Compound B2a(ii)

Compound 1D3, 1-((1R,1′R,3R,3′R,5S,5′S)-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)-3-chloroquinoxalin-2(1H)-one, was prepared as described in Example 3 herein.

To a solution of a compound 1D3 (0.5 mmol, 213 mg) and TEA (1.0 mmol, 102 mg, Sigma-Aldrich, St. Louis, Mo.) in DMSO (3 mL) at temperature of about 25° C. was added (S)-azetidine-2-carboxylic acid (30, 1.0 mmol, 101 mg, Sigma-Aldrich). The resulting reaction mixture was heated to 100° C. and stirred at that temperature for 2 hours. Thereafter, the mixture was evaporated under reduced pressure to provide a product which was chromatographed on a flash column eluted with DCM/MeOH to provide Azetidine-Substituted Quinoxaline-Type Piperidine Compound B2a(ii), (S)-1-(4-((1R,3R,5S)-9-((1R,3r,5S)-bicyclo[3.3.1]nonan-3-yl)-9-azabicyclo[3.3.1]nonan-3-yl)-3-oxo-3,4-dihydroquinoxalin-2-yl)azetidine-2-carboxylic acid (yield 24%).

The identity of Azetidine-Substituted Quinoxaline-Type Piperidine Compound B2a(ii) was confirmed using ¹H NMR and MS.

Azetidine-Substituted Quinoxaline-Type Piperidine Compound B2a(ii): ¹H NMR: δ_(H) (ppm, CD₃OD): 7.67 (d, J=8.3 Hz, 1H), 7.53 (d, J=7.9 Hz, 1H), 7.32 (m, 2H), 5.36 (br, 2H), 4.36 (m, 2H), 4.20 (d, J=10.9 Hz, 3H), 3.04 (m, 2H), 2.87 (br, 1H), 2.69 (d, J=13.1 Hz, 1H), 2.30-2.21 (m, 9H), 1.79 (m, 13H); MS: m/e=491.4 [M+1].

5.2 Example 2 Synthesis of Compound 1C3

2-Adamantanediol (34, 500 g, 2.97 mol, Sigma-Aldrich), p-tosyl chloride (624 g, 3.27 mol, Sigma-Aldrich), and pyridine (1.5 L) were combined and stirred under an argon atmosphere. The reaction mixture was heated to a temperature in the range of 68-71° C. and remained at that temperature for 2.5 h. The reaction mixture was cooled to a temperature of about 25° C. and poured into saturated brine (6 L). The resulting mixture was extracted three times with MTBE (4 L for each extraction). The organic portions were combined, dried (MgSO₄), filtered, and concentrated onto 1 kg silica gel (pre-treated with hexanes:TEA). The adsorbed material was chromatographed on 1.5 kg silica eluted sequentially with 1:10 EtOAc:hexanes (5 L) then 2:10 EtOAc:hexanes (5 L). All product fractions were combined and evaporated under reduced pressure to provide a residue. The residue was suspended in deionized water (2 L), stirred for 10 min, and filtered under reduced pressure to remove any excess reactants. The remaining solids were taken up in MTBE (2 L), dried (MgSO₄), filtered, and evaporated under reduced pressure to provide 301 g of Compound 35, (1R,5S)-7-methylenebicyclo[3.3.1]nonan-3-one, as a white crystalline solid (yield 67%).

The identity of Compound 35 was confirmed using ¹H NMR and TLC.

Compound 35: ¹H NMR: δ_(H) (400 MHz, CDCl₃): 4.79 (2H, s), 2.51 (8H, m), 2.29 (2H, m), 1.94 (2H, m), 1.60 (1H, m); TLC (SiO₂) 1:10 EtOAc:hexanes: R_(f)=0.25 (visualized with KMnO₄ spray reagent).

Compound 35 (250 g, 1.66 mol) was divided into five equal batches. Under a hydrogen atmosphere, the first batch was hydrogenated over platinum black (5 g, Sigma-Aldrich) at 50 psi in dry 99:1 cyclohexane:EtOAc (200 mL) for 2 h. The reaction mixture was decanted and the remaining catalyst washed with cyclohexane until no product remained as determined by TLC. The reaction flask was then recharged with the next batch of Compound 35, cyclohexane (200 mL), and hydrogen and the reaction mixture was hydrogenated at 50 psi for 2 h. This procedure was repeated until all batches were reacted. All filtrates were combined, filtered through CELITE, and concentrated at a temperature of about 25° C. to provide Compound 36, 7-methylbicyclo[3.3.1]nonan-3-one, as a colorless oil.

The identity of Compound 36 was confirmed using ¹H NMR and TLC.

Compound 36: ¹H NMR: δ_(H) (400 MHz, CDCl₃): 2.42 (4H, m), 2.26 (2H, m), 1.98-2.00 (3H, m), 1.65 (1H, m), 1.54 (1H, m), 0.80 (1H, m); TLC (SiO₂) 2:10 EtOAc:hexanes: R_(f)=0.30 (visualized with KMnO₄ spray reagent).

Compound 36, taken directly from the previous step, was taken up in AcOH (1 L). To this was added 50% aqueous NH₂OH (100 mL, Sigma-Aldrich). With stirring, the reaction mixture was heated to a gentle reflux and refluxed for 1 h. The mixture was cooled to a temperature of about 25° C. and slowly poured into 2.5M Na₂CO₃ aqueous solution (5 L) with stirring. Thereafter, the mixture was stirred vigorously for 1 h. Deionized water (1 L) was added and the mixture was stirred for another 0.5 h. The precipitate that formed was collected by filtering under reduced pressure and washed with deionized water (2 L). The residue was taken up in DCM (1 L), dried (MgSO₄), filtered, and evaporated under reduced pressure to provide 231.5 g of Compound 37, 7-methylbicyclo[3.3.1]nonan-3-one oxime, as a white fluffy solid (85% yield from Compound 35).

The identity of Compound 37 was confirmed using ¹H NMR.

Compound 37: ¹H NMR: δ_(H) (400 MHz, CDCl₃): 3.21 (1H, d), 2.05-2.41 (4H, m), 1.73-2.11 (4H, m), 1.51-1.73 (2H, m), 1.33 (1H, d), 0.82 (4H, m), 0.63 (1H, t).

To a three neck 5 L round bottom flask equipped with an overhead stirrer, 1 L pressure equalizing dropping funnel, and temperature probe was added toluene (about 3 L) and Na metal (67.17 g, 2.8 mol, Sigma-Aldrich). Under an argon atmosphere, the mixture was heated to a gentle reflux until the Na metal became molten. A solution of a portion of Compound 37 (66.66 g, 0.40 mol) in dry isopropyl alcohol (230 mL) was then added dropwise via the dropping funnel over 1.5 h. With stirring, the resulting reaction mixture was heated to reflux and refluxed for 16 h. After cooling to a temperature of about 25° C., the following materials were added in sequential order: EtOH (164 mL) dropwise over 15 min, 1:1 EtOH:H₂O (164 mL) dropwise over 15 min, and water (500 mL) dropwise over 30 min. The resulting mixture was stirred for 2 h. The mixture was poured into a 6 L separatory funnel and the organic layer was separated. The aqueous portion was extracted three times with Et₂O (1 L for each extraction).

The process just described was repeated twice more with 66.66 g of Compound 37 being used each time. All organic portions were combined, dried (MgSO₄), and filtered into a 6 L Erlenmeyer flask. To the mixture was added 2M HCl in Et₂O (1.5 L, 2.5 eq). The mixture was allowed to stir and cool in an ice:MeOH bath for 1 h. The solids that formed were filtered under reduced pressure and dried under reduced pressure at 50° C. for 18 h to provide 100.01 g of Compound 38, (3s,7s)-7-methylbicyclo[3.3.1]nonan-3-amine hydrochloride, as a white crystalline solid. The filtrate was evaporated under reduced pressure to provide a residue which was triturated with Et₂O (2 L). The solids that remained were filtered and washed with Et₂O (2 L) to provide 87.1 g of a second crop of Compound 38 after drying (overall yield 39%).

The identity of Compound 38 was confirmed using ¹H NMR.

Compound 38: ¹H NMR: δ_(H) (400 MHz, CDCl₃): 8.28 (3H, bs), 3.55 (1H, m), 2.25 (2H, m), 1.81-2.09 (4H, m), 1.85 (1H, m), 1.61 (3H, m) 1.08 (1H, d), 0.70-0.88 (5H, m).

Compound 38 (87.1 g, 0.463 mol), 9-benzyl-3-oxo-9-azoniabicyclo[3.3.1]nonane bromide (39, 165.20 g, 0.509 mol, Sigma-Aldrich), potassium carbonate (67.83 g, 0.491 mol), EtOH (1.07 L), and water (346 mL) were combined. The resulting reaction mixture was stirred for about 16 h at a temperature of about 25° C. The reaction mixture was then heated to reflux and refluxed for 3 h. Thereafter, the mixture was cooled to a temperature of about 25° C. then further cooled to 5° C. in an ice/MeOH bath and allowed to stir for 30 min at that temperature. The solids that formed were filtered under reduced pressure, washed with deionized water, and dried under reduced pressure to provide 102.1 g of Compound 40, (1R,3r,5S,7s)-7-methyl-9′-aza[3,9′-bi(bicyclo[3.3.1]nonan)]-3′-one, as an off-white crystalline solid (yield 80%).

The identity of Compound 40 was confirmed using ¹H NMR.

Compound 40: ¹H NMR: δ_(H) (400 MHz, CDCl₃): 3.68 (2H, m), 3.05 (1H, m), 2.61 (2H, m), 2.25 (4H, m), 1.98 (1H, m), 1.85 (4H, m), 1.49-1.78 (7H, m), 1.25 (2H, m), 1.07 (1H, d), 0.86 (3H, d), 0.78 (2H, t).

Compound 40 (67 g, 0.243 mol), THF (500 mL), and AcOH (41.78 mL, 0.730 mol) were combined. To this mixture was added 50% aqueous NH₂OH (45 mL, 0.730 mol). With stirring, the resulting reaction mixture was heated to reflux and refluxed for 1 h. The mixture was cooled to a temperature of about 25° C. and deionized water was added (500 mL). Potassium carbonate (100 g, 0.730 mol) in deionized water (500 mL) was then added in one portion. The resulting mixture was stirred and cooled in an ice bath for 1 h. The solids that formed were filtered under reduced pressure and dried under reduced pressure at 60° C. to provide Compound 41, (1R,3r,5S,7s)-7-methyl-9′-aza[3,9′-bi(bicyclo[3.3.1]nonan)]-3′-one oxime (yield>99%).

The identity of Compound 41 was confirmed using ¹H NMR.

Compound 41: ¹H NMR: δ_(H) (400 MHz, CD₃OD): 3.76 (1H, m), 3.45 (2H, m), 3.18 (1H, m), 3.02 (1H, m), 2.62 (1H, m), 2.27 (4H, m), 1.78-2.08 (7H, m), 1.67 (1H, m), 1.58 (2H, m), 1.46 (1H, m), 1.22 (2H, t), 1.09 (1H, d), 0.85 (5H, m).

Compound 41 (70.01 g, 0.241 mol) was taken up in AcOH (400 mL). This mixture was divided into two batches. Under a hydrogen atmosphere, to each batch was added platinum (IV) oxide (5.98 g, 0.2 eq, Sigma-Aldrich) and each batch was then hydrogenated at 50 psi for 16 h to 18 h. The batches were combined and filtered through CELITE. The filter cake was washed with AcOH (500 mL). The filtrate was concentrated under reduced pressure at 70° C. to provide an oil. To the oil was added MTBE (6 L). The mixture was stirred and cooled to 0° C. for 1 h. The white precipitate that formed was filtered under reduced pressure, washed with Et₂O (2 L), and dried under reduced pressure to provide 76.2 g of Compound 42, (1R,1′R,3r,3′R,5S,5′S,7S)-7-methyl-9′-aza[3,9′-bi(bicyclo[3.3.1]nonan)]-3′-amine acetate, as a white solid (yield 94%).

The identity of Compound 42 was confirmed using ¹H NMR and LC/MS.

Compound 42: ¹H NMR: δ_(H) (400 MHz, CD₃OD): 3.73 (2H, m), 3.55 (1H, m), 2.46 (2H, m), 2.24 (2H, m), 1.75-2.12 (11H, m), 1.45-1.75 (4H, m), 1.28 (4H, m), 1.06 (1H, d), 0.89 (3H, d), 0.80 (2H, t); LC/MS (t_(r)=1.689 min): m/z=277.3 [M+H]⁺ (Calc: 276.5).

Compound 42 (80.0 g, 0.23 mol), 1-fluoro-2-nitrobenzene (35.69 g, 0.253 mol, Sigma-Aldrich), and potassium carbonate (95.36 g, 0.69 mol) were combined in dry DMF (400 mL). The reaction mixture was heated to 110° C. under an argon atmosphere for 1 h then cooled to a temperature of about 25° C. Deionized water (2 L) was added and the mixture was stirred and cooled in an ice/MeOH bath for 1 h. The resulting solids were filtered under reduced pressure, washed with deionized water (4 L), and dried under reduced pressure to provide 66.81 g of Compound 43, (1R,1′R,3r,3′R,5S,5′S,7S)-7-methyl-N-(2-nitrophenyl)-9′-aza[3,9′-bi(bicyclo[3.3.1]nonan)]-3′-amine, as a orange solid (yield 73%).

The identity of Compound 43 was confirmed using ¹H NMR and LC/MS.

Compound 43: ¹H NMR: δ_(H) (400 MHz, CDCl₃): 8.17 (1H, d), 8.01 (1H, m), 7.43 (1H, t), 6.93 (1H, d), 6.61 (1H, t), 3.95 (1H, m), 3.45 (2H, m), 3.06 (1H, m), 2.48 (2H, m), 2.20 (2H, m), 1.87-2.08 (4H, m), 1.45-1.89 (6H, m), 1.35 (2H, t), 0.95-1.22 (5H, m), 0.87 (5H, m); LC/MS (t_(r)=2.732 min): m/z=398.4 [M+H]⁺ (Calc: 397.6).

Compound 43 (30.0 g, 75.57 mmol) was taken up in DCM (100 mL). Under a hydrogen atmosphere, to this was added Pd/C (3 g) and, with stirring, the reaction mixture was hydrogenated at 50 psi for 2 h at a temperature of about 25° C. to provide Compound 44, N¹-((1R,1′R,3r,3′R,5S,5′S,7S)-7-methyl-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)benzene-1,2-diamine.

The identity of Compound 44 was confirmed using LC/MS.

Compound 44: LC/MS (t_(r)=2.045 min): m/z=368.9 [M+H]⁺ (Calc: 367.6).

The reaction mixture containing Compound 44, taken directly from the previous step, was filtered through CELITE. Ethyl 2-chloro-2-oxoacetate (12.65 mL, 113.36 mmol, Sigma-Aldrich) was added and the reaction mixture was stirred at a temperature of about 25° C. for 30 min. Thereafter, the mixture was evaporated under reduced pressure in a rotary evaporator to provide a residue. The residue was taken up in EtOH (800 mL) and potassium carbonate (31.33 g, 226.71 mmol) was added. The resulting mixture was heated to reflux, refluxed for 1 h, then cooled to a temperature of about 25° C. The solids that formed were filtered and washed with EtOH. The filtered solids were then triturated with deionized water and filtered under reduced pressure to provide 27.49 g of Compound 45, 1-((1R,1′R,3r,3′R,5S,5′S,7S)-7-methyl-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)quinoxaline-2,3(1H,4H)-dione, as an off-white crystalline solid.

The identity of Compound 45 was confirmed using ¹H NMR and LC/MS.

Compound 45: ¹H NMR: δ_(H) (400 MHz, DMSO-d₆): 7.26 (1H, m), 7.05 (3H, m), 4.80 (1H, bs), 3.44 (2H, m), 3.08 (1H, m), 2.25-2.46 (3H, m), 2.05 (2H, m), 1.93 (4H, m), 1.82 (2H, m), 1.69 (4H, m), 1.54 (1H, m), 1.18 (4H, m), 1.01 (1H, m), 0.88 (5H, m); LC/MS (t_(r)=2.048 min): m/z=422.3 [M+H]⁺ (Calc: 421.6).

Compound 45, taken directly from the previous step, was suspended in DCE (250 mL) and DMF (2.5 mL). Thionyl chloride (20 equivalents, Sigma-Aldrich) was added dropwise. The resulting reaction mixture was heated to reflux and refluxed for 2 h. The mixture was evaporated under reduced pressure to provide a residue which was triturated with MTBE. The residue was stirred for 1 h in MTBE then filtered under reduced pressure to provide 24.13 g of Compound 1C3, 3-chloro-1-((1R,1′R,3R,3′R,5S,5′S,7S)-7-methyl-9′-aza[3,9′-bi(bicyclo[3.3.1]nonan)]-3′-yl)quinoxalin-2(1H)-one, as the hydrochloride (82% yield from Compound 43).

The identity of Compound 1C3 was confirmed using ¹H NMR and LC/MS.

Compound 1C3: ¹H NMR: δ_(H) (400 MHz, CDCl₃): 11.05 (1H, bs), 8.79 (1H, d), 7.79 (2H, m), 7.43 (1H, t), 6.55 (1H, m), 4.10 (2H, m), 3.81 (1H, m), 3.00 (2H, t), 2.92 (1H, m), 2.47 (6H, m), 2.09 (4H, m), 1.50-1.93 (7H, m), 1.39 (1H, d), 0.92 (3H, d), 0.65 (2H, m); LC/MS (t_(r)=2.588 min): m/z=442.3 [M+H]⁺ (Calc: 440.0).

5.3 Example 3 Synthesis of Compound 1D3

2-Adamantanone (46, 1000 g, 6.66 mol, Sigma-Aldrich) was dissolved in 2,2,2-trifluoroacetic acid (3 L, Sigma-Aldrich). To this mechanically stirred mixture surrounded by a cooling bath with a temperature maintained at 20° C. was added sodium percarbonate (1254.8 g, 7.99 mol, Sigma-Aldrich) portion-wise over 1 h; the temperature of the reaction mixture increased to 60° C. during the addition. After 2 h additional stirring, deionized water (4 L) was added followed by four extractions with DCM (2 L for each extraction). The organic portions were combined, dried (MgSO₄), filtered, and evaporated under reduced pressure to provide 1180 g of Compound 47, (1R,3r,6s,8S)-4-oxatricyclo[4.3.1.13,8]undecan-5-one, as a white crystalline solid (yield 97%).

The identity of Compound 47 was confirmed using ¹H NMR and TLC.

Compound 47: ¹H NMR: δ_(H) (400 MHz, CDCl₃): 4.48 (1H, s), 3.06 (1H, m), 2.09 (2H, m), 2.00 (3H, m), 1.95 (2H, m), 1.81 (2H, m), 1.70 (2H, m); TLC (SiO₂) 1:1 EtOAc:hexanes: R_(f)=0.8 (visualized with molybdenum blue spray reagent).

Compound 47 (1572.7 g, 9.46 mol) was taken up in MeOH (2 L). To this was added NaOH (2270 g, 56.7 mol) in deionized water (6 L); the temperature of the mixture increased from about 25° C. to 54° C. during the addition. With stirring, the resulting reaction mixture was heated to a gentle reflux and refluxed for 36 h. After cooling to a temperature of about 25° C., the MeOH was removed by vacuum distillation at 60° C. The resulting solution was stirred and acidified with concentrated HCl to a pH of about 2.5. The white precipitate that formed was allowed to stir for 18 h at a temperature of about 25° C. then filtered under reduced pressure to provide partially dried Compound 48, (1R,3r,5S,7r)-7-hydroxybicyclo[3.3.1]nonane-3-carboxylic acid.

The identity of Compound 48 was confirmed using ¹H NMR and TLC.

Compound 48: ¹H NMR: δ_(H) (400 MHz, DMSO-d₆): 11.88 (1H, s), 4.44 (1H, s), 3.73 (1H, m), 1.95 (4H, m), 1.63 (2H, m), 1.41 (3H, m), 1.22 (2H, m), 1.16 (1H, m); TLC (SiO₂) 2:1:0.1 EtOAc:hexanes:AcOH: R_(f)=0.3 (visualized with molybdenum blue spray reagent).

Compound 48, taken directly from the previous step, was suspended in toluene (8 L). To this was added methane sulfonic acid (367 mL, 4.73 mol, Sigma-Aldrich). With stirring, the resulting reaction mixture was heated to reflux and water removed azeotropically for 5 h. After cooling to a temperature of about 25° C., deionized water (4 L) was added with stirring. The organic layer was separated, dried (MgSO₄), filtered, and concentrated to provide Compound 49, (1R,3S,5S)-bicyclo[3.3.1]non-6-ene-3-carboxylic acid.

The identity of Compound 49 was confirmed using ¹H NMR and TLC.

Compound 49: ¹H NMR: δ_(H) (400 MHz, CDCl₃): 10.45 (1H, bs), 5.85 (1H, m), 5.70 (1H, m), 2.79 (1H, m), 2.37 (2H, m), 2.11 (1H, m), 1.81 (3H, m), 1.61 (4H, m); TLC (SiO₂) 1:1:0.1 EtOAc:hexanes:AcOH: R_(f)=0.8 (visualized with molybdenum blue spray reagent).

Compound 49, taken directly from the previous step, was taken up in MeOH (1 L). This was divided into six batches and to each, under a hydrogen atmosphere, was added 10% Pd/C (0.01 mol). The reaction mixtures were each hydrogenated at 50 psi until hydrogen uptake ceased (10 h to 15 h). The mixtures were combined, filtered through CELITE, and NaOH (1 kg) in deionized water (400 mL) was added. The mixture was stirred for 4 h at a temperature of about 25° C. The mixture was concentrated under reduced pressure and deionized water (4 L) was added. Concentrated HCl was added until a pH within the range of 3-4 was achieved. The white solid that formed was allowed to stir for 1 h at a temperature of about 25° C. and then was filtered under reduced pressure to provide 1.232 kg of Compound 50, (1R,3r,5S)-bicyclo[3.3.1]nonane-3-carboxylic acid, as an off-white crystalline solid (78% yield from Compound 47).

The identity of Compound 50 was confirmed using ¹H NMR and TLC.

Compound 50: ¹H NMR: δ_(H) (400 MHz, CDCl₃): 9.25 (1H, bs), 3.13 (1H, m), 1.97 (4H, m), 1.80 (2H, m), 1.70 (5H, m), 1.57 (3H, m); TLC (SiO₂) 1:1:0.1 EtOAc:hexanes:AcOH: R_(f)=0.8 (visualized with molybdenum blue spray reagent).

Compound 50 (1108.5 g, 6.59 mol) was taken up in toluene (5 L) in a 20 L reaction vessel. To this was added TEA (1013.3 mL, 7.26 mol). The resulting mixture was stirred and heated to 75° C. under a nitrogen atmosphere. The diphenyl phosphoryl azide (DPPA, 1564 mL, 7.26 mol, Sigma-Aldrich) was diluted with toluene to 2 L total volume and added slowly via addition funnel over 1.5 h; during this addition the temperature increased by about 10° C. to 15° C. The resulting reaction mixture was allowed to stir for 3 h at 75° C. The mixture was then concentrated to a brownish-yellow oil by vacuum distillation at 90° C. The oil was cooled to 5° C. and THF (2.5 L) was added. The mixture was allowed to stir and cool to 0° C. NaOH (792 g, 19.80 mol) in deionized water (3 L) was added over 1 h keeping the temperature below 5° C. The mixture was stirred for 18 h at 5° C. The resulting mixture was then extracted twice with Et₂O (4 L for each extraction). To the remaining aqueous mixture at 5° C. was slowly added concentrated HCl until a pH of about 6-7 was reached; no significant change in temperature occurred during this neutralization. The resulting white precipitate was allowed to stir for 2 h at 0° C. The precipitate was then filtered under reduced pressure and dried under reduced pressure at 50° C. to provide 1.875 kg of Compound 51, (1R,3R,5S)-bicyclo[3.3.1]nonan-3-amine diphenyl phosphate salt, as a white solid (yield 73.1%).

The identity of Compound 51 was confirmed using ¹H NMR.

Compound 51: ¹H NMR: δ_(H) (400 MHz, DMSO-d₆): 7.78 (2H, s), 7.22 (4H, t), 7.11 (4H, m), 6.93 (2H, t), 3.61 (1H, m), 3.31 (1H, s), 1.93 (4H, m), 1.33-1.60 (10H, m).

Compound 51 (1037.5 g, 2.67 mol) and Compound 39 (1000 g, 3.08 mol) were suspended in EtOH (6.2 L) and deionized water (2 L). To this stirred mixture was added potassium carbonate (390.72 g, 2.83 mol) in deionized water (800 mL). The resulting reaction mixture was stirred for 18 h at a temperature of about 25° C. The reaction mixture was then heated to reflux, about 81° C., and refluxed for 3 h. Thereafter, the mixture was allowed to cool slowly over 4 h to a temperature of about 25° C. with vigorous stirring during which time a white precipitate formed. The mixture was then cooled to 5° C. and allowed to stir for 2 h at that temperature. The white precipitate was filtered under reduced pressure, washed with deionized water (8 L), and dried under reduced pressure at 60° C. to provide 580.1 g of Compound 52, (1R,1′R,3r,5S,5′S)-9′-aza[3,9′-bi(bicyclo[3.3.1]nonan)]-3′-one, as a white crystalline solid (yield 83.1%).

The identity of Compound 52 was confirmed using ¹H NMR and TLC.

Compound 52: ¹H NMR: δ_(H) (400 MHz, CDCl₃): 3.69 (2H, s), 3.38 (1H, m), 2.62 (2H, m), 2.21 (2H, d), 2.12 (4H, m), 1.85 (2H, m), 1.41-1.78 (14H, m); TLC (SiO₂) 7:3 hexanes:EtOAc: R_(f)=0.4 (visualized with potassium iodoplatinate spray).

Compound 52 (580.1 g, 2.22 mol) and THF (4 L) were introduced into a reactor; the reactor temperature control was set to 18° C. 50% Aqueous NH₂OH (415 mL, 6.66 mol) was added followed by the slow addition of AcOH (381.25 mL, 6.66 mol). The temperature of the reaction mixture increased to 28° C. during the addition. The reaction mixture was stirred for 16 h at a temperature of about 25° C. then heated to a gentle reflux and refluxed for 1 h. The mixture was cooled to a temperature of about 25° C. and deionized water (4 L) and DCM (4 L) were added. With vigorous stirring, solid NaHCO₃ (560 g, 6.66 mol) was then slowly added over 30 min and the mixture was allowed to stir until effervescence ceased. The white precipitate that formed was filtered under reduced pressure, washed with deionized water (1 L), and dried under reduced pressure at 60° C. for 72 h to provide 432.5 g of Compound 53, (1R,1′R,3R,5S,5′S)-9′-aza[3,9′-bi(bicyclo[3.3.1]nonan)]-3′-one oxime, as a white solid (yield 70.6%). The filtrate was allowed to form layers and the organic layer was separated. The aqueous layer was washed three times with DCM (2 L for each wash). The organic portions were combined, dried (MgSO₄), filtered, and evaporated under reduced pressure to provide a pale yellow solid. The solid was triturated with 10:1 Et₂O:EtOAc (1 L), stirred for 1 h, and filtered under reduced pressure to provide a residue which was dried under reduced pressure at 60° C. for 72 h to provide an additional 138.4 g of Compound 53 as a white solid (yield 22.6%, overall yield 93.2%).

Compound 53 (570.9 g, 2.07 mol) was taken up in AcOH (3 L). This mixture, with a total dissolved volume of 3.3 L, was divided into ten 330 mL batches. Under a hydrogen atmosphere, to each batch was added platinum (IV) oxide (9.40 g, 0.041 mol) and each batch was then hydrogenated at 50 psi for 16 h to 18 h. The batches were combined and filtered through CELITE. The filter cake was washed with AcOH (500 mL). The filtrate was concentrated under reduced pressure at 70° C. to provide an oil. To the oil was added Et₂O (6 L). The mixture was stirred and cooled to 0° C. for 1 h. The white precipitate that formed was filtered under reduced pressure and washed with Et₂O (2 L) to provide 253.4 g of Compound 54, (1R,1′R,3R,3′R,5S,5′S)-9′-aza[3,9′-bi(bicyclo[3.3.1]nonan)]-3′-amine acetate (yield 35.3%). The filtrate was evaporated under reduced pressure to provide a residue which was subjected to the same treatment with Et₂O. A second crop of 213.7 g of Compound 54 was isolated (yield 32.1%). The filtrate was again evaporated under reduced pressure to provide 201.1 g of Compound 54 (yield 25.4%, overall yield 92.8%).

The identity of Compound 54 was confirmed using ¹H NMR.

Compound 54: ¹H NMR: δ_(H) (400 MHz, CD₃OD): 3.63 (3H, m), 3.42 (1H, m), 2.36 (2H, m), 2.01 (5H, m), 1.89 (5H, m), 1.39-1.78 (13H, m), 1.12 (2H, m).

In part 1, Compound 54 (439.0 g, 1.36 mol) and MeCN (4 L) were introduced into a reactor; the reactor temperature control was set to 25° C. To this mixture were added TEA (412.9 g, 4.08 mol, 3 eq) and 1-fluoro-2-nitrobenzene (194.2 g, 1.38 mol, 1 eq). The reaction mixture was heated to reflux, refluxed for 6 days, then cooled to 0° C. The yellow precipitate that formed was collected by filtration under reduced pressure. The filter cake was washed four times with DCM (2 L for each wash) and the filtrates were set aside. The remaining 91 g of solids, comprising recovered Compound 54, were dried and set aside.

In part 2, the reaction described in part 1 above was repeated using the recovered Compound 54 starting material except DMF (2 L) and K₂CO₃ (3 eq) were used. After stirring for 2 h at 110° C., the reaction mixture was cooled to a temperature of about 25° C. and poured into deionized water (4 L). This mixture was extracted six times with Et₂O (2 L for each extraction). The organic portions were combined and evaporated under reduced pressure to provide a residue.

The residue from part 2 and the filtrates from part 1 were combined and the resulting combination was evaporated under reduced pressure to provide an oil. The oil was triturated with deionized water (4 L). The solids that formed were filtered under reduced pressure and washed with further deionized water. The solids were then dried under reduced pressure at 60° C. for 48 h to provide 402 g of Compound 55, (1R,1′R,3R,3′R,5S,5′S)—N-(2-nitrophenyl)-9′-aza[3,9′-bi(bicyclo[3.3.1]nonan)]-3′-amine, as a bright yellow solid (yield 77%).

Compound 55 (402 g, 1.05 mol) was taken up in MeOH (2.5 L). This mixture was divided into ten batches. Under a hydrogen atmosphere, to each batch was added 10% Pd/C (0.04 mol) and, with stirring, each batch was hydrogenated at 50 psi for 3 h at a temperature of about 25° C. The batches were filtered through CELITE and the filter cake washed with MeOH. The filtrate was evaporated under reduced pressure to provide a residue which was triturated with Et₂O then filtered under reduced pressure to provide Compound 56, N¹-((1R,1′R,3R,3′R,5S,5′S)-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)-benzene-1,2-diamine, as a light brown solid (yield>99%).

Compound 57, 1-((1R,1′R,3R,3′R,5S,5′S)-[3,9′-bi(9′-azabicyclo[3.3.1]nonan)]-3′-yl)quinoxaline-2,3(1H,4H)-dione, was prepared from Compound 56 and ethyl 2-chloro-2-oxoacetate in a similar manner to the previously-described preparation of Compound 45 from Compound 44 (yield 95%).

The identity of Compound 57 was confirmed using ¹H NMR.

Compound 57: ¹H NMR: δ_(H) (400 MHz, CDCl₃): 7.74, (1H, d, J=8.7 Hz), 7.55 (2H, m), 7.30 (1H, dt, J=8.7, 1.5 Hz), 5.13 (1H, bs), 3.50-3.40 (3H, m), 2.65 (2H, bt), 2.40 (1H, m), 2.00-1.87 (6H, m), 1.86-1.30 (15H, m), 1.03 (2H, m).

Compound 57 (6.5 g, 15.95 mmol) was suspended in DCM (150 mL). Thionyl chloride (20 mL) was added followed by the addition of DMF (1 mL). The resulting reaction mixture was heated to reflux and refluxed for 1 h. The mixture was evaporated under reduced pressure to provide a residue which was triturated with MTBE (100 mL) to provide a light brown solid. The solid was partitioned between ice-water:aqueous sodium carbonate solution (400 mL) and DCM (400 mL). The organic layer was separated, dried (MgSO₄), and evaporated under reduced pressure to provide a yellow solid. The solid was triturated with Et₂O (150 mL) to provide 4.8 g of Compound 1D3 as a white solid (yield 71%).

The identity of Compound 1D3 was confirmed using ¹H NMR and LC/MS.

Compound 1D3: ¹H NMR: δ_(H) (400 MHz, CDCl₃): 8.82 (1H, d, J=7.4 Hz), 7.62 (2H, m), 7.37 (1H, m), 5.19 (1H, br), 3.55 (3H, m), 2.73 (2H, m), 2.47 (1H, m), 2.10-1.94 (5H, m), 1.90-1.50 (11H, m), 1.43 (3H, m), 1.10 (2H, d, J=13.0 Hz); LC/MS (t_(r)=2.925 min): m/z=426.1 [M+H]⁺ (Calc: 425.2).

5.4 Example 4 Synthesis of Azetidine-Substituted Quinoxaline-Type Piperidine Compounds

Using procedures similar to those described above, the following Azetidine-Substituted Quinoxaline-Type Piperidine Compounds were prepared from the corresponding 3-chloroquinoxalin-2(1H)-one and azetidine carboxylic acid reactants. The azetidine carboxylic acids are commercially available from, e.g., Synthonix Corp., Wake Forest, N.C.; IS Chemical Technology, Shanghai, China; and/or Fluka Chemie AG, Buchs, Switzerland, or can be prepared by methods known to the art, e.g., Hanessian et al., “Asymmetric Synthesis of L-Azetidine-2-Carboxylic Acid and 3-Substituted Congeners—Conformationally Constrained Analogs of Phenylalanine, Naphthylalanine, and Leucine,” Bioorg. Med. Chem. Lett. 9:1437-1442 (1999); Enders et al., “Asymmetric Synthesis of Substituted Azetidine Type α- and β-Amino Acids,” Synthesis 20:3508-3516 (2005); and/or Brandi et al., “Novel Syntheses of Azetidines and Azetidinones,” Chem. Rev. 108:3988-4035 (2008), which are hereby incorporated by reference in their entireties. The 3-chloroquinoxalin-2(1H)-ones are commercially available or can be prepared by methods known to the art, e.g., as described in U.S. Patent Application Publication Nos. US 2010/0216726 A1 (see, e.g., Examples 3, 14, 17, and 29) and/or US 2011/0178090 A1, which are hereby incorporated by reference in their entireties. For example, with respect to the following compounds:

Compound 1A2, 3-chloro-1-((1R,3R,5S)-8-((2R,3aS,5S,6aS)-octahydro-2,5-methanopentalen-3a-yl)-8-azabicyclo[3.2.1]octan-3-yl)quinoxalin-2(1H)-one, is commercially available or can be prepared, inter alia, as described in Example 14 of U.S. Patent Application Publication US 2010/0216726 A1 (preparation of Substituted-Quinoxaline-Type Piperidine Compound 347) except using 3-noradamantamine hydrochloride (see Example 36 therein) in place of the compound of formula EE (8-cyclooctyl-8-azabicyclo[3.2.1]octan-3-one) therein. Compound 1B3, 3-chloro-1-((1R,3R,5S)-9-cyclooctyl-9-azabicyclo[3.3.1]nonan-3-yl)-quinoxalin-2(1H)-one, is commercially available or can be prepared, inter alia, as described in Example 14 of U.S. Patent Application Publication US 2010/0216726 A1 (preparation of Substituted-Quinoxaline-Type Piperidine Compound 347) except using the compound of formula LC (9-cyclooctyl-9-azabicyclo[3.3.1]nonan-3-one) from Example 35 therein in place of the compound of formula EE (8-cyclooctyl-8-azabicyclo[3.2.1]octan-3-one).

A11a(i): ¹H NMR: δ_(H) (ppm, CD₃OD): 7.35 (m, 2H), 7.09 (m, 2H), 5.24 (br s, 2H), 4.05 (m, 3H), 2.91 (m, 1H), 2.64 (m, 1H), 2.32-1.58 (m, 16H), 1.10 (m, 1H), 0.79 (m, 3H), 0.51 (m, 2H); MS: m/e=491.4 [M+1].

A11a(ii): ¹H NMR: δ_(H) (ppm, CD₃OD): 7.41 (m, 2H), 7.12 (m, 2H), 5.35 (m, 2H), 4.11-3.98 (m, 3H), 2.90 (m, 1H), 2.74 (m, 3H), 2.36 (m, 5H), 2.11 (m, 4H), 1.82-1.55 (m, 6H), 1.12 (m, 2H), 0.80 (d, J=6.0 Hz, 3H), 0.56 (m, 2H); MS: m/e=491.4 [M+1].

B2a(i): ¹H NMR: δ_(H) (ppm, CD₃OD): 8.47-8.31 (br, 1H), 7.79-7.39 (m, 3H), 6.01-5.83 (m, 2H), 4.82-4.57 (m, 2H), 4.85-4.15 (m, 3H), 3.21-3.05 (m, 1H), 3.03-2.75 (m, 2H), 2.76-2.43 (m, 4H), 2.44-2.30 (m, 2H), 2.30-2.08 (m, 6H), 1.93-1.53 (m, 11H); MS: m/e=491.4 [M+1].

B11a(i): ¹H NMR: δ_(H) (ppm, CD₃OD): 7.92-7.72 (d, J=7.9 Hz, 1H), 7.60-7.44 (d, J=2.4 Hz, 1H), 7.40-7.09 (m, 2H), 5.90-5.58 (br, 1H), 4.52-4.11 (m, 4H), 4.02-3.80 (br, 1H), 3.13-2.96 (m, 2H), 2.93-2.79 (m, 1H), 2.66-2.50 (m, 1H), 2.50-2.27 (m, 4H), 2.24-1.97 (m, 7H), 1.99-1.85 (m, 1H), 1.98-1.51 (m, 7H), 1.27-1.11 (m, 3H), 1.10-0.60 (m, 3H); MS: m/e=505.3 [M+1]

B11a(ii): ¹H NMR: δ_(H) (ppm, CD₃OD): 7.69 (m, 1H), 7.46 (m, 1H), 7.22 (m, 2H), 5.30 (m, 2H), 4.27 (m, 1H), 4.01 (m, 2H), 3.74 (m, 2H), 2.74 (m, 3H), 2.36 (m, 3H), 2.11 (m, 3H), 1.92-1.57 (m, 10H), 1.20 (m, 2H), 0.91 (d, J=6.2 Hz, 3H), 0.75 (m, 2H); MS: m/e=505.3 [M+1].

B12a: ¹H NMR: δ_(H) (ppm, CD₃OD): 7.91 (d, J=8.6 Hz, 1H), 7.58 (d, J=7.9 Hz, 1H), 7.41 (m, 2H), 5.59-5.47 (m, 1H), 4.80-4.67 (m, 2H), 4.32-4.19 (d, J=11.6 Hz, 2H), 4.00-3.76 (m, 2H), 3.29-3.04 (m, 2H), 3.04-2.86 (t, J=12.7 Hz, 2H), 2.73-2.59 (m, 1H), 2.55-2.26 (m, 5H), 2.20-1.95 (m, 5H), 1.54-1.94 (m, 6H), 1.42-1.11 (d, 3H), 1.23-1.09 (d, J=13.3 Hz, 1H), 0.87-0.67 (t, J=13.1 Hz, 3H); MS: m/e=505.3 [M+1].

B20a(i): ¹H NMR: δ_(H) (ppm, CD₃OD): 8.09 (br s, 1H), 7.47 (d, J=8.55 Hz, 1H), 7.29 (t, J=7.45 Hz, 1H), 7.21 (t, J=8.11 Hz, 1H), 5.79 (br s, 1H), 5.31 (br s, 1H), 4.41-4.10 (m, 4H), 3.81 (br s, 1H), 2.94 (t, J=12.06 Hz, 2H), 2.78 (m, 2H), 2.27 (m, 5H), 2.21-1.85 (m, 7H), 1.79 (m, 2H), 1.63 (m, 2H), 1.47 (m, 2H), 1.23 (m, 3H), 0.89 (t, J=8.11 Hz, 3H), 0.65 (t, J=13.15 Hz, 2H); MS: m/e=519.4 [M+1].

B20a(ii): ¹H NMR: δ_(H) (ppm, CD₃OD): 7.83 (d, J=7.89 Hz, 1H), 7.51 (d, J=7.23 Hz, 1H), 7.28 (m, 2H), 5.56-5.26 (m, 2H), 4.47-4.41 (m, 2H), 3.91 (m, 1H), 3.03 (m, 2H), 2.85 (m, 1H), 2.68 (m, 1H), 2.49-2.02 (m, 11H), 1.96-1.45 (m, 7H), 1.28 (m, 2H), 1.22 (m, 1H), 0.93 (t, J=7.2 Hz, 3H), 0.79 (m, 2H); MS: m/e=519.4 [M+1].

B21a: ¹H NMR: δ_(H) (ppm, CD₃OD): 7.98 (br s, 1H), 7.39 (dd, J=1.53, 8.11 Hz, 1H), 7.19 (t, J=7.67 Hz, 1H), 7.12 (t, J=7.23 Hz, 1H), 5.69 (br s, 1H), 4.53 (br s, 1H), 4.06 (d, J=9.87 Hz, 2H), 3.75 (m, 1H), 3.45 (m, 1H), 2.92 (t, J=12.93 Hz, 2H), 2.72 (m, 1H), 2.32 (m, 4H), 2.15-1.82 (m, 8H), 1.74 (t, J=14.69 Hz, 2H), 1.61 (d, J=14.47 Hz, 2H), 1.40 (m, 1H), 1.15 (t, J=7.23 Hz, 3H), 0.82 (t, J=7.45 Hz, 3H), 0.58 (t, J=14.03 Hz, 2H); MS: m/e=519.4 [M+1].

B34a: ¹H NMR: δ_(H) (ppm, CD₃OD): 7.87 (m, 1H), 7.46 (m, 1H), 7.24 (m, 2H), 5.53 (br s, 1H), 4.64 (m, 1H), 4.22 (m, 4H), 3.63 (m, 1H), 3.10 (m, 3H), 2.75 (m, 3H), 2.41 (m, 3H), 2.14-1.60 (m, 11H), 1.22 (m, 2H), 0.95 (d, J=8.4 Hz, 3H), 0.82 (m, 2H); MS: m/e=519.4 [M+1].

C2a(ii): ¹H NMR: δ_(H) (ppm, CD₃OD): 7.93 (br s, 1H), 7.41 (d, J=7.45 Hz, 1H), 7.14 (m, 2H), 5.86 (br s, 1H), 5.22 (br s, 1H), 4.46-4.09 (m, 2H), 3.95 (d, J=12.06 Hz, 2H), 3.85 (br s, 1H), 3.62 (d, J=12.06 Hz, 2H), 3.54 (d, J=10.30 Hz, 2H), 2.75-2.48 (m, 3H), 2.35-2.16 (m, 3H), 2.01 (m, 4H), 1.63 (m, 10H); MS: m/e=493.2 [M+1].

C20a(ii): ¹H NMR: δ_(H) (ppm, CD₃OD): 7.93 (br, 1H), 7.38 (br, 1H), 7.09 (m, 2H), 6.08-5.64 (br, 1H), 5.34-5.02 (br, 1H), 4.23 (m, 2H), 3.81-3.72 (d, J=11.4 Hz, 2H), 3.69-3.60 (d, J=11.4 Hz, 2H), 3.45-3.37 (d, J=10.3 Hz, 2H), 3.26-3.00 (m, 1H), 2.78-2.62 (m, 1H), 2.54-2.39 (m, 1H), 2.00-1.92 (m, 7H), 1.90-1.82 (d, J=12.3 Hz, 2H), 1.75-1.67 (d, J=13.3 Hz, 1H), 1.28-1.16 (m, 5H), 1.03-1.00 (d, J=12.5 Hz, 1H) 0.85-0.79 (t, J=7.2 Hz, 5H); MS: m/e=521.3 [M+1].

C21a: ¹H NMR: δ_(H) (ppm, CD₃OD): 7.92 (m, 1H), 7.41 (m, 1H), 7.15 (m, 2H), 6.10 (m, 1H), 4.05 (m, 3H), 3.85-3.55 (m, 2H), 2.75 (m, 2H), 2.50 (m, 4H), 2.11 (m, 4H), 1.80 (m, 1H), 1.61-1.05 (m, 8H), 0.85 (m, 5H); MS: m/e=521.3 [M+1].

C39a: ¹H NMR: δ_(H) (ppm, CD₃OD): 7.90 (m, 1H), 7.40 (m, 1H), 7.12 (m, 2H), 6.07 (m, 1H), 4.06-3.81 (m, 5H), 2.94 (m, 1H), 2.64 (m, 2H), 2.28 (m, 4H), 2.08 (m, 2H), 1.93 (m, 1H), 1.82 (m, 1H), 1.55-1.10 (m, 8H), 0.83 (m, 5H); MS: m/e=535.2 [M+1].

E53a(i): ¹H NMR: δ_(H) (ppm, CD₃OD): 8.01 (d, J=9.0 Hz, 1H), 7.45 (d, J=8.3 Hz, 1H), 7.27 (t, J=8.3 Hz, 1H), 7.09 (t, J=8.1 Hz, 1H), 5.66 (br, 1H), 5.25 (br, 1H), 4.47 (br, 1H), 4.29 (br, 1H), 3.77 (m, 2H), 3.22 (t, J=9.6 Hz, 2H), 2.91-2.74 (m, 3H), 2.69-2.56 (m, 1H), 2.45-2.22 (m, 4H), 2.13-1.85 (m, 10H), 1.71 (m, 1H), 1.64-1.48 (m, 3H), 1.23 (s, 3H), 1.11 (s, 3H), 0.94 (d, J=9.4 Hz, 1H); MS: m/e=519.2 [M+1].

E53a(ii): ¹H NMR: δ_(H) (ppm, CD₃OD): 7.70 (m, 1H), 7.38 (m, 1H), 7.16 (m, 2H), 5.30 (m, 2H), 4.21 (m, 1H), 3.68 (m, 1H), 3.16 (m, 2H), 2.72 (m, 3H), 2.39 (m, 4H), 1.98 (m, 10H), 1.61 (m, 4H), 1.23 (s, 3H), 1.07 (s, 3H), 0.95 (m, 2H); MS: m/e=519.2 [M+1].

E54a: ¹H NMR: δ_(H) (ppm, CD₃OD): 7.62 (d, J=9.2 Hz, 1H), 7.44 (d, J=6.6 Hz, 1H), 7.25 (t, J=8.6 Hz, 1H), 7.12 (t, J=8.1 Hz, 1H), 5.46 (br, 1H), 4.63 (br, 4H), 3.78-3.69 (m, 2H), 3.48 (m, 1H), 3.11 (m, 2H), 2.87 (m, 2H), 2.64 (m, 1H), 2.41-2.25 (m, 3H), 2.14-1.95 (m, 4H), 1.94-1.83 (m, 4H), 1.83-1.69 (m, 3H), 1.58-1.45 (m, 3H), 1.20 (s, 3H), 1.04 (s, 3H), 0.92 (d, J=9.6 Hz, 1H); MS: m/e=519.2 [M+1].

H3a: ¹H NMR: δ_(H) (ppm, CD₃OD): 7.68-7.54 (d, J=7.9 Hz, 1H), 7.49-7.36 (d, J=2.4 Hz, 1H), 7.32-7.15 (m, 2H), 5.38-5.19 (br, 1H), 4.20-4.02 (d, J=9.8 Hz, 2H), 3.86-3.74 (m, 1H), 3.67-3.55 (m, 1H), 2.95-2.78 (t, J=13.4 Hz, 2H), 2.66-2.50 (br, 1H), 2.46-2.25 (m, 2H), 2.13-1.98 (t, J=14.3 Hz, 2H), 1.96-1.80 (br, 4H), 1.82-1.64 (br, 4H), 1.65-1.35 (br, 17H); MS: m/e=507.4 [M+1].

K2b(ii): ¹H NMR: δ_(H) (ppm, CDCl₃): 8.15 (m, 1H), 7.93 (m, 1H), 7.51 (m, 1H), 7.33 (m, 1H), 6.00 (m, 1H), 5.81 (m, 1H), 4.87 (m, 2H), 4.25 (m, 2H), 3.01 (m, 4H), 2.60-2.04 (m, 10H), 1.87 (m, 4H), 1.72 (m, 4H), 1.40 (m, 4H); MS: m/e=491.4 [M+1].

K29b: ¹H-NMR: δ (300 MHz, CDCl₃-CD₃OD-DCl): 1.26-1.44 (m, 4H), 1.64-1.77 (m, 4H), 1.79-1.92 (m, 4H), 2.12-2.35 (m, 6H), 2.39-2.51 (m, 2H), 2.74-2.85 (m, 2H) 2.92 (dd, J=22.0, 10.7 Hz, 2H), 3.03 (t, J=12.5 Hz, 1H), 3.20-3.33 (m, 1H), 3.37-3.55 (m, 1H), 4.25 (s, 2H), 4.63 (s, 1H), 4.87 (s, 1H), 4.94-5.11 (m, 1H), 5.26 (s, 1H), 6.08 (s, 1H), 7.28-7.32 (m, 1H), 7.45 (t, J=7.9 Hz, 1H), 8.02 (d, J=9.3 Hz, 1H), 8.15 (d, J=7.3 Hz, 0.5H), 8.24 (d, J=8.0 Hz, 0.5H); LC/MS: m/z=505.3 [M+H]⁺.

L2b(i): ¹H NMR: δ_(H) (ppm, CDCl₃): 8.47 (m, 1H), 8.13 (m, 1H), 7.52 (m, 1H), 7.34 (m, 1H), 6.14 (m, 1H), 5.77 (br s, 1H), 5.02 (m, 2H), 4.16 (m, 2H), 3.82 (m, 1H), 3.02 (m, 1H), 2.97-2.34 (m, 9H), 2.02-1.64 (m, 13H), 1.47 (m, 3H); MS: m/e=505.3 [M+1].

L2b(ii): ¹H NMR: δ_(H) (ppm, CDCl₃): 8.51 (br s, 1H), 7.42-7.25 (m, 3H), 6.27 (m, 1H), 5.14 (t, J=8.4 Hz, 1H), 4.58 (m, 2H), 4.11 (m, 2H), 3.80 (m, 1H), 2.84 (m, 4H), 2.45 (m, 5H), 1.98-1.31 (m, 16H); MS: m/e=505.3 [M+1].

L29b: ¹H-NMR (300 MHz, CDCl₃-CD₃OD-DCl) δ: 1.31-1.52 (m, 4H), 1.63-1.93 (m, 11H), 2.01 (t, J=13.3 Hz, 2H), 2.35-2.56 (m, 6H), 2.61-2.89 (m, 5H), 3.17-3.45 (m, 1H), 3.84 (br, 1H), 4.17 (d, J=10.8 Hz, 2H), 4.63 (br, 1H), 4.85 (br, 1H), 4.96-5.12 (m, 1H), 5.24 (t, J=10.0 Hz, 1H), 6.18 (m, 1H) 7.18-7.32 (m, 1H), 7.49 (t, J=7.9 Hz, 1H), 8.17 (d, J=8.0 Hz, 0.75H), 8.26 (d, J=8.0 Hz, 0.25H), 8.52 (d, J=8.5 Hz, 1H): LC/MS: m/z=519.4 [M+H]⁺.

Synthesis of 3-Amino-1-[4-((1S,3R,5R)-(1R,6S,8S)-9-bicyclo[4.3.1]-dec-8-yl-9-aza-bicyclo[3.3.1]non-3-yl)-3-oxo-3,4-dihydro-quinoxalin-2-yl]-azetidine-3-carboxylic acid (ZA01)

To a solution of Compound 1 (150 mg, 0.341 mmol) in DMSO (3 ml) were added 3-aminoazetidine-3-carboxylic acid dihydrochloride (129 mg, 0.682 mmol) and DBU (0.462 ml, 3.07 mmol) at r.t. under N₂. The mixture was stirred at 60° C. for 1 hour. The reaction mixture was concentrated in vacuo. The resulting oil was purified by column chromatography (silica-gel 12 g, CHCl₃/(10% NH₄OH-MeOH)=4/1˜7/3). The resulting oil was triturated with MeOH:Et₂O (1:1) and dried under reduced pressure at 80° C. to give Compound ZA01 as a white solid (yield; 88 mg, 50%).

ZA01: ¹H-NMR (400 MHz, d6-DMSO-DCl) δ: 1.34-2.00 (m, 18H), 2.14-2.77 (m, 11H), 3.66-3.80 (m, 1H), 4.13-4.25 (m, 2H), 4.86 (d, J=13.2 Hz, 1H), 4.91 (d, J=13.2 Hz, 1H), 5.18 (d, J=12.4 Hz, 1H), 5.23 (d, J=12.7 Hz, 1H), 5.95-6.10 (m, 1H), 7.32-7.42 (m, 2H), 7.96-8.04 (m, 1H), 8.52 (d, J=7.53 Hz, 1H); LC/MS: m/z=520.4[M+H]⁺.

Synthesis of (2S,3R)-3-acetylamino-1-[4-((1S,3R,5R)-(1R,6S,8S)-9-bicyclo[4.3.1]dec-8-yl-9-aza-bicyclo[3.3.1]non-3-yl)-3-oxo-3,4-dihydro-quinoxalin-2-yl]-azetidine-2-carboxylic acid (ZA02)

To Compound 58 (30 g, 139 mmol) was added AcOH:H₂O (4:1) (300 ml) at r.t. under N₂. The mixture was stirred at r.t. for 18 hours and at 40° C. for 5 hours. The reaction mixture was concentrated in vacuo. The resulting oil was diluted with saturated aqueous NaHCO₃, then extracted with AcOEt twice. The combined organic phases were washed with water and saturated aqueous NaCl and dried over Na₂SO₄ and concentrated in vacuo. To a solution of resulting oil in DMF (150 ml) were added imidazole (14.24 g, 209 mmol) and TBDPSCl (35.8 ml, 139 mmol) at 0° C. under N₂. The mixture was stirred at 0° C. for 1.5 hours. The reaction mixture was diluted with 5% citric acid (aq.), and then extracted with AcOEt twice. The combined organic phases were washed with water and saturated NaCl (aq.) and dried over Na₂SO₄ and concentrated in vacuo. The resulting oil was purified by column chromatography (silica-gel 330 g, Hex/AcOEt=19/1˜1/1) to give Compound 60 as a yellow oil (yield; 21.6 g, 38%).

60: ¹H-NMR (400 MHz, CDCl₃) δ: 1.07 (s, 9H), 2.74 (d, J=6.40 Hz, 1H), 3.74-3.83 (m, 5H), 3.98-4.13 (m, 2H), 7.38-7.49 (m, 6H), 7.66 (d, J=6.53 Hz, 4H).

To a solution of Compound 60 (21.57 g, 52.2 mmol) in THF:EtOH(1:1) (220 ml) was added LiBH₄ (2.272 g, 104 mmol) portionwise at r.t. under N₂. The mixture was stirred at r.t. for 1 hour. The reaction mixture was diluted with saturated NH₄Cl (aq.), and then extracted with AcOEt twice. The combined organic phases were washed with water and saturated NaCl (aq.) and dried over Na₂SO₄ and subsequently concentrated in vacuo. The resulting oil was purified by column chromatography (silica-gel 220 g, Hex/AcOEt=17/3˜2/3) to give Compound 61 as a yellow oil (yield; 8.79 g, 44%).

61: ¹H-NMR (400 MHz, CDCl₃) δ: 1.10 (s, 9H), 2.17 (t, J=6.27 Hz, 1H), 2.68 (d, J=5.78 Hz, 1H), 3.55-3.62 (m, 1H), 3.71-3.89 (m, 4H), 3.92-4.000 (m, 1H), 7.40-7.50 (m, 6H), 7.65-7.70 (m, 4H).

To a solution of Compound 61 (8.77 g, 22.75 mmol) in DCM (175 ml) were added DMAP (0.556 g, 4.55 mmol), Et₃N (9.46 ml, 68.2 mmol) and MsCl (5.32 ml, 68.2 mmol) at 0° C. under N₂. The mixture was stirred at 0° C. for 1.5 hours. The reaction mixture was diluted with 10% citric acid (aq.), and then extracted with DCM twice. The combined organic phases were washed with water and saturated NaCl (aq.) and dried over Na₂SO₄ and concentrated in vacuo. The resulting oil was purified by column chromatography (silica-gel 80 g, Hex/AcOEt=7/3˜2/3) to give Compound 62 as a yellow oil (yield; 11.5 g, 93%).

62: ¹H-NMR (400 MHz, CDCl₃) δ: 1.10 (s, 9H), 2.94 (s, 3H), 3.09 (s, 3H), 3.93 (dd, J=12.0, 3.97 Hz, 1H), 3.99 (dd, J=12.0, 4.27 Hz, 1H), 4.24 (td, J=6.90, 3.26 Hz, 1H), 4.32 (dd, J=10.8, 7.28 Hz, 1H), 4.53 (dd, J=10.8, 3.02 Hz, 1H), 4.67 (dt, J=7.78, 4.01 Hz, 1H), 7.41-7.49 (m, 6H), 7.64-7.70 (m, 4H).

To Compound 62 (10.99 g, 20.29 mmol) was added BnNH₂ (110 ml, 1006 mmol) at r.t. under N₂. The mixture was stirred at 100° C. for 5 hours. The reaction mixture was purified by column chromatography (silica-gel 330 g, Hex/AcOEt=7/3). The resulting oil was purified again by column chromatography (amino silica-gel 200 g, Hex/AcOEt=7/3) to give Compound 63 as a colorless oil (yield; 4.12 g, 45%).

63: ¹H-NMR (400 MHz, CDCl₃) δ: 1.05 (s, 9H), 3.12 (dd, J=8.16, 6.78 Hz, 1H), 3.32 (d, J=8.66 Hz, 1H), 3.44-3.61 (m, 3H), 3.76 (d, J=12.9 Hz, 1H), 3.91 (dd, J=10.0, 7.78 Hz, 1H), 4.09-4.15 (m, 1H), 7.19-7.31 (m, 5H), 7.38-7.49 (m, 6H), 7.65-7.71 (m, 4H).

To a solution of Compound 63 (1 g, 2.190 mmol) in THF:H₂O (2:1) (15 ml) was added Ph₃P (0.689 g, 2.63 mmol) at r.t. under N₂. The mixture was stirred at 70° C. for 18 hours. The reaction mixture was concentrated in vacuo. To a solution of resulting oil in THF (10 ml) were added Ac₂O (0.414 ml, 4.38 mmol) and Et₃N (0.911 ml, 6.57 mmol) at r.t. under N₂. The mixture was stirred at r.t. for 3 hours. The reaction mixture was concentrated in vacuo. The resulting oil was purified by column chromatography (amino silica-gel 120 g, Hex/AcOEt=7/3˜3/7) to give Compound 65 as a pale yellow oil (yield; 1.00 g, 97%).

65: ¹H-NMR (400 MHz, CDCl₃) δ: 1.12 (s, 9H), 1.93 (s, 3H), 3.23-3.28 (m, 2H), 3.46-3.53 (m, 2H), 3.71-3.81 (m, 2H), 3.86 (d, J=13.0 Hz, 1H), 4.72 (br, 1H), 7.10-7.17 (m, 1H), 7.25-7.50 (m, 11H), 7.68-7.75 (m, 4H).

To a solution of Compound 65 (1.00 g, 2.116 mmol) in MeOH (10 ml) was added 20% Pd(OH)₂/C (1 g) at r.t. under N₂. The mixture was stirred at r.t. for 36 hours under 1 atm H₂. The reaction mixture was filtrated. The filtrate was concentrated in vacuo. The resulting oil was purified by column chromatography (silica-gel 12 g, CHCl₃/(10% NH₄OH/MeOH)=100/0˜9/1) to give Compound 66 as a pale yellow oil (yield; 458 mg, 57%).

66: ¹H-NMR (400 MHz, CDCl₃) δ: 1.08 (s, 9H), 3.51 (t, J=7.59 Hz, 1H), 3.77 (t, J=8.19 Hz, 1H), 3.80-3.88 (m, 3H), 4.96-5.06 (m, 1H), 6.71-6.79 (m, 1H), 7.30-7.43 (m, 6H), 7.59-7.64 (m, 4H).

To a solution of Compound 66 (457.8 mg, 1.197 mmol) in DMSO (11 ml) added Compound 1 (579 mg, 1.316 mmol) and DBU (0.361 ml, 2.393 mmol) at r.t. under N₂. The mixture was stirred at 50° C. for 3 hours. The reaction mixture was diluted with 10% citric acid (aq.) and brine (1:1), then extracted with AcOEt-CHCl₃ (5:2) twice. The combined organic phases were washed with water and saturated NaCl (aq.) and dried over Na₂SO₄ and concentrated in vacuo. To a solution of resulting residue in THF (11 ml) were added AcOH (0.082 ml, 1.436 mmol) and TBAF (2.87 ml, 2.87 mmol) at r.t. under N₂. The mixture was stirred at r.t. for 18 hours. The mixture was concentrated in vacuo. The resulting oil was purified by column chromatography (silica-gel 80 g, Hex/AcOEt=7/3˜3/7) to give Compound 69 as a yellow oil (yield; 546 mg, 83%).

69: LC/MS: m/z=548.5 [M+H]+.

To a solution of (COCl)2 (0.435 ml, 4.98 mmol) in DCM (10 ml) was added a solution of DMSO (0.707 ml, 9.95 mmol) in DCM (5 ml) dropwise at −78° C. under N₂. The mixture was stirred at −78° C. for 10 min. To this mixture was added a solution of Compound 69 (545 mg, 0.995 mmol) in DCM (10 ml). After the mixture was stirred at −78° C. for 1 hour, Et₃N (2.76 ml, 19.90 mmol) was added to the mixture dropwise. The mixture was stirred at −78° C. for 3 hours. The reaction mixture was diluted with 10% NaH₂PO₄ (aq.), and then extracted with DCM twice. The combined organic phases were washed with water and saturated NaCl (aq.) and dried over Na₂SO₄ and concentrated in vacuo. To a solution of resulting residue in tert-BuOH:H₂O (2:1) (60 ml) were added 2-methyl-2-butene (2.11 ml, 19.9 mmol), NaH₂PO₄ (358 mg, 2.99 mmol) and NaClO₂ (810 mg, 8.96 mmol). The mixture was stirred at r.t. for 4 hours. The reaction mixture was diluted with 10% NaH₂PO₄ (aq.): brine (1:1), then extracted with CHCl₃ twice. The combined organic phases were washed with water and saturated NaCl (aq.) and dried over Na₂SO₄ and concentrated in vacuo. The resulting solid was purified by PTLC (Merck PTLC 20 cm×20 cm×1 mm 4 pieces, CHCl₃/10% (NH₄OH/MeOH)=4/1) to give the white solid. The solid was triturated with CHCl₃-Et₂O (1:8) and dried under reduced pressure at 80° C. to give Compound ZA02 as a white solid (yield; 122.1 mg, 22%).

ZA02: ¹H-NMR (400 MHz, CDCl₃-d₄-MeOH-DCl) δ: 1.37-1.99 (m, 21H), 2.14-2.43 (m, 8H), 2.51-2.78 (m, 2H), 3.66-3.77 (m, 1H), 4.15-4.25 (m, 2H), 4.65 (dd, J=11.5, 6.77 Hz, 1H), 4.83 (dd, J=11.8, 9.04 Hz, 1H), 5.07-5.18 (m, 1H), 5.74 (d, J=8.03 Hz, 1H), 5.93-6.06 (m, 1H), 7.35-7.43 (m, 2H), 8.05-8.09 (m, 1H), 8.47-8.55 (m, 1H); LC/MS: m/z=562.3 [M+H]⁺.

Synthesis of 1-[4-((1S,3R,5R)-(1R,6S,8S)-9-Bicyclo[4.3.1]dec-8-yl-9-aza-bicyclo[3.3.1]non-3-yl)-3-oxo-3,4-dihydro-quinoxalin-2-yl]-3-dimethylamino-azetidine-3-carboxylic acid (ZA03)

To a solution of Compound ZA01 (294 mg, 0.568 mmol) in MeOH:AcOH (9:1) (10 ml) were added formaldehyde (244 mg, 2.84 mmol) and 2-picoline borane (182 mg, 1.704 mmol) at r.t. under N₂. The mixture was stirred at r.t. for 2 hours. The reaction mixture was quenched with saturated NH₄Cl (aq.), and then concentrated in vacuo. The residue was purified by column chromatography (silica-gel 12 g, CHCl₃/(10% NH₄OH:MeOH)=9/1˜3/2) to give the white solid. The solid was triturated with MeCN and dried under reduced pressure at 90° C. to give Compound ZA03 as a white solid (yield; 177 mg, 57%).

ZA03: ¹H-NMR (400 MHz, d6-DMSO-DCl) δ: 1.33-2.01 (m, 18H), 2.11-2.80 (m, 9H), 2.96 (s, 6H), 3.67-3.80 (m, 1H), 4.14-4.28 (m, 2H), 3.89 (d, J=16.7 Hz, 1H), 4.93 (d, J=16.8 Hz, 1H), 5.24 (d, J=12.3 Hz, 1H), 5.33 (d, J=12.6 Hz, 1H), 5.93-6.15 (m, 1H), 7.32-7.42 (m, 2H), 7.84-7.89 (m, 1H), 8.48-8.55 (m, 1H); LC/MS: m/z=548.4 [M+H]⁺.

Synthesis of (2S,3R)-3-Amino-1-[4-((1S,3R,5R)-(1R,6S,8S)-9-bicyclo[4.3.1]dec-8-yl-9-aza-bicyclo[3.3.1]non-3-yl)-3-oxo-3,4-dihydro-quinoxalin-2-yl]-azetidine-2-carboxylic acid (ZA04)

To a solution of Compound 63 (3.03 g, 6.64 mmol) in THF:H₂O (2:1) (45 ml) was added Ph₃P (2.088 g, 7.96 mmol) at r.t. under N₂. The mixture was stirred at 70° C. for 18 hours. The reaction mixture was concentrated in vacuo. To a solution of resulting oil in THF (30 ml) were added Boc₂O (2.311 ml, 9.95 mmol) and Et₃N (1.839 ml, 13.27 mmol) at r.t. under N₂. The mixture was stirred at r.t. for 1 hour. The reaction mixture was concentrated in vacuo. The resulting oil was purified by column chromatography (amino silica-gel 120 g, Hex/AcOEt=17/3˜1/1) to give a yellow oil. This oil was purified again by column chromatography (silica-gel 80 g, Hex/AcOEt=17/3˜1/1) to give Compound 72 as a yellow oil (yield; 1.82 mg, 52%).

72: ¹H-NMR (400 MHz, CDCl₃) δ: 0.98, (s, 9H), 1.12 (s, 9H), 3.21-3.23 (m, 2H), 3.43-3.50 (m, 2H), 3.70-3.80 (m, 2H), 3.82 (d, J=13.0 Hz, 1H), 5.12 (br, 1H), 7.11-7.18 (m, 1H), 7.27-7.53 (m, 11H), 7.65-7.72 (m, 4H).

Using procedures similar to the above, the Compound 73 was prepared from Compound 1 and 72.

To a solution of Compound 73 (850.2 mg, 1.372 mmol) in DCM (8 ml) was added TFA (4 ml, 51.9 mmol) at r.t. under N₂. The mixture was stirred at r.t. for 2 hours. The reaction mixture was concentrated in vacuo. The resulting oil was purified by column chromatography (silica-gel 24 g, CHCl₃/(10% NH₄OH-MeOH)=4/1˜3/7). The resulting oil was triturated with MeCN:H₂O (1:1) and dried under reduced pressure at 100° C. to give Compound ZA04 as a white solid (yield; 422 mg, 59%).

ZA04: ¹H-NMR (400 MHz, d6-DMSO-DCl) δ: 1.31-2.02 (m, 18H), 2.14-2.81 (m, 8H), 3.65-3.81 (m, 1H), 4.12-4.24 (m, 2H), 4.41-4.68 (m, 2H), 4.80-4.91 (m, 0.5H), 4.96-5.07 (m, 0.5H), 5.80-5.93 (m, 2H), 5.97-6.10 (m, 1H), 7.33-7.43 (m, 2H), 7.86-7.94 (m, 1H), 8.45-8.57 (m, 1H), 9.21 (br, 2H); LC/MS: m/z=520.4 [M+H]⁺.

Synthesis (2S,3R)-1-[4-((1S,3R,5R)-(1R,6S,8S)-9-bicyclo[4.3.1]dec-8-yl-9-aza-bicyclo[3.3.1]non-3-yl)-3-oxo-3,4-dihydro-quinoxalin-2-yl]-3-dimethylamino-azetidine-2-carboxylic acid (ZA05)

To a solution of Compound ZA04 (120 mg, 0.231 mmol) in MeOH:AcOH (9:1) (2.5 ml) were added formaldehyde (34.7 mg, 1.155 mmol) and 2-picoline borane (74.1 mg, 0.693 mmol) at r.t. under N₂. The mixture was stirred at r.t. for 1.5 hours. The reaction mixture was quench with saturated NH₄Cl (aq.), and then concentrated in vacuo. The residue was purified by column chromatography (silica-gel 12 g, CHCl₃/(10% NH₄OH-MeOH)=9/1˜3/2) to give a white solid. The solid was triturated with MeOH and dried under reduced pressure at 90° C. to give Compound ZA05 as a white solid (yield; 66.1 m, 52%).

ZA05: ¹H-NMR (400 MHz, d6-DMSO-DCl) δ: 1.30-2.00 (m, 18H), 2.13-2.79 (m, 9H), 2.90 (s, 6H), 3.68-3.79 (m, 1H), 4.14-4.27 (m, 2H), 4.38-4.54 (m, 1.4H), 4.70-4.84 (m, 1H), 4.99-5.09 (m, 0.6H), 5.73-5.84 (m, 1H), 5.97-6.11 (m, 1H), 7.31-7.41 (m, 2H), 7.65-7.74 (m, 0.6H), 7.76-7.85 (m, 0.4H), 8.42-8.56 (m, 1H); LC/MS: m/z=548.4 [M+H]⁺.

Synthesis of (2S,3R)-1-[4-((1S,3R,5R)-(1R,6S,8S)-9-bicyclo[4.3.1]dec-8-yl-9-aza-bicyclo[3.3.1]non-3-yl)-3-oxo-3,4-dihydro-quinoxalin-2-yl]-3-methylamino-azetidine-2-carboxylic acid (ZA06)

To a solution of Compound 73 (210.2 mg, 0.339 mmol) in DMF (4 ml) were added NaH (67.8 mg, 1.696 mmol) and MeI (0.424 ml, 6.78 mmol) at 0° C. under N₂. The mixture was stirred at 0° C. for 2 hours. The reaction mixture was diluted with 10% citric acid (aq.):brine (1:1), and then extracted with AcOEt twice. The combined organic phases were washed with water and saturated NaCl (aq.) and dried over Na₂SO₄ and concentrated in vacuo. To a solution of resulting oil in THF:MeOH (1:1) (2.8 ml)₂ mol/L LiOH (aq.) (0.339 ml, 0.678 mmol) was added. The mixture was stirred at r.t. for 1 hour. and then, after 2 mol/L NaOH (aq.) (0.339 ml, 0.678 mmol) was added to this mixture, the mixture was stirred at r.t. for 18 hours. The reaction mixture was diluted with 10% citric acid (aq.):brine (1:1), and then extracted with CHCl₃ twice. The combined organic phases were washed with water and saturated NaCl (aq.) and dried over Na₂SO₄ and concentrated. To a solution of resulting residue in DCM (2 ml) was added to TFA (2 ml, 26.0 mmol). The mixture was stirred at r.t. for 1 hour. The reaction mixture was concentrated in vacuo. The residue was purified by column chromatography (silica-gel 12 g, CHCl₃/(10% NH₄OH-MeOH)=4/1˜7/3) to give a yellow solid. The solid was triturated with CHCl₃-Et₂O (1:6) and dried under reduced pressure at 80° C. to give Compound ZA06 as a white solid. (Yield; 62.1 mg, 34%).

ZA06: ¹H-NMR (400 MHz, d6-DMSO-DCl) δ: 1.29-2.03 (m, 18H), 2.11-2.82 (m, 13H), 3.65-3.82 (m, 1H), 4.14-4.24 (m, 2H), 4.24-4.32 (m, 1H), 4.49-4.59 (m, 0.7H), 4.74-4.83 (m, 0.7H), 4.84-4.93 (m, 0.3H), 4.99-5.08 (m, 0.3H), 5.63-5.72 (m, 0.3H), 5.82-5.89 (m, 0.7H), 5.96-6.11 (m, 1H), 7.33-7.43 (m, 2H), 7.66-7.74 (m, 0.3H), 7.82-7.89 (m, 0.7H), 8.44-8.54 (m, 1H); LC/MS: m/z=534.3 [M+H]⁺.

Synthesis (2S,3S)-1-[4-((1S,3R,5R)-(1R,6S,8S)-9-bicyclo[4.3.1]dec-8-yl-9-aza-bicyclo[3.3.1]non-3-yl)-3-oxo-3,4-dihydro-quinoxalin-2-yl]-3-methoxy-azetidine-2-carboxylic acid (ZA07)

To a solution of Compound 76 (2 g, 10.52 mmol) in MeCN (60 ml) were added Ag₂O (3.6 g, 15.53 mmol) and MeI (20 ml, 320 mmol) at r.t. under N₂. The mixture was stirred at 70° C. for 18 hours. The reaction mixture was filtrated. The filtrate was concentrated in vacuo. The resulting oil was purified by column chromatography (silica-gel 24 g, Hex/EtOAc=7/3˜1/1) to give Compound 77 as a colorless oil (yield; 2.06 g, 96%).

77: ¹H-NMR (400 MHz, CDCl₃): 1.38 (s, 3H), 1.45 (s. 3H), 3.49 (d. 3H), 3.82 (s, 3H), 3.85 (d, J=6.02 Hz, 1H), 3.96 (dd, J=8.66, 6.53 Hz, 1H), 4.05 (dd, J=8.66, 6.62 Hz, 1H), 4.38 (q, J=6.36 Hz, 1H).

Using procedures similar to the above, Compound 78 was prepared from Compound 77.

To Compound 78 (1.5 g, 2.83 mmol) was added allylamine (15 ml, 200 mmol) at r.t. under N₂. The mixture was stirred at 100° C. for 15 hours in a sealed tube. The reaction mixture was concentrated in vacuo. The residue was purified by column chromatography (amino silica-gel 60 g, Hex/EtOAc=9/1) to give Compound 79 as a colorless oil (yield; 945 mg, 85%).

79: ¹H-NMR (400 MHz, CDCl₃): 1.05 (s, 9H), 2.69 (t, J=6.75 Hz, 1H), 2.96-3.02 (m, 1H), 3.10-3.16 (m, 1H), 3.29 (s, 3H), 3.29-3.34 (m, 1H), 3.62-3.75 (m, 4H), 5.03 (d, J=10.5 Hz, 1H), 5.14 (d, J=16.9 Hz, 1H), 5.68-5.79 (m, 1H), 7.35-7.46 (m, 6H), 7.67-7.71 (m, 4H).

To a solution of Compound 79 (944 mg, 2.386 mmol) in EtOH:H₂O (2:1) (20 ml) was added 10% Pd/C (944 mg) at r.t. under N₂. The mixture was stirred at 100° C. for 3 hours. The reaction mixture was filtrated. The filtrate was concentrated in vacuo. The resulting oil was purified by column chromatography (silica-gel 12 g, CHCl₃/(10% NH₄OH/MeOH)=100/0˜9/1) to give Compound 80 as a pale yellow oil (yield; 547 mg, 65%).

80: ¹H-NMR (400 MHz, CDCl₃) δ: 1.07 (s, 9H), 3.27 (s, 3H), 3.44 (dd, J=8.54, 6.22 Hz, 1H), 3.58 (dd, J=8.28, 6.77 Hz, 1H), 3.71 (d, J=5.40 Hz, 1H), 3.81 (q, J=5.19 Hz, 1H), 4.00 (q, J=6.11 Hz, 1H), 7.36-7.46 (m, 6H), 7.65-7.69 (m, 4H).

Using procedures similar to the above, Compound ZA07 was prepared from Compound 1 and 80.

ZA07: ¹H-NMR (400 MHz, d6-DMSO-DCl) δ: 1.31-2.01 (m, 18H), 2.10-2.75 (m, 9H), 3.38 (s, 3H), 3.67-3.78 (m, 1H), 4.14-4.25 (m, 2H), 4.31-4.42 (m, 1.7H), 4.57-4.65 (m, 0.3H), 4.85-4.95 (m, 0.7H), 5.10-5.18 (m, 0.3H), 5.44-5.49 (m, 1H), 5.92-6.09 (m, 1H), 7.33-7.44 (m, 2H), 7.85-7.93 (m, 0.311), 8.00-8.06 (m, 0.7H), 8.47-8.56 (m, 1H); LC/MS: m/z=535.3 [M+H]⁺.

Using procedures similar to the above, the following Compounds were prepared.

ZA08: ¹H-NMR (400 MHz, d6-DMSO-DCl) δ: 1.33-1.73 (m, 11H), 1.86-2.73 (m, 14H), 3.33 (s, 3H), 3.99-4.15 (m, 3H), 4.22-4.37 (m, 1.7H), 4.48-4.59 (m, 0.3H), 4.76-4.88 (m, 0.7H), 4.99-5.11 (m, 0.3H), 5.36-5.42 (m, 1H), 5.90-6.24 (m, 1H), 7.27-7.40 (m, 2H), 7.77-7.86 (m, 0.3H), 7.90-8.00 (m, 0.7H), 8.41-8.52 (m, 1H); LC/MS: m/z=521.3 [M+H]⁺.

ZA09: ¹H-NMR (300 MHz, CDCl₃-CD₃OD-DCl) δ: 1.31-1.50 (m, 1H), 1.50-1.88 (m, 10H), 1.97 (s, 4H), 2.21 (s, 2H), 2.36-2.95 (m, 7H), 4.02-4.30 (m, 3H), 4.56 (br s, 1H), 4.96-5.47 (m, 2H), 6.03 (s, 1H), 6.23 (s, 1H), 7.22-7.34 (m, 1H), 7.45 (br s, 1H), 7.77-7.91 (m, 1H), 8.38-8.50 (m, 1H); LC/MS: m/z=506.3 [M+H]⁺.

ZA10: ¹H-NMR (300 MHz, CDCl₃-CD₃OD-DCl) δ: 1.39 (br s, 1H), 1.57 (d, J=12.9 Hz, 1H), 1.61-1.89 (m, 9H), 1.97 (br s, 3H), 2.23 (s, 2H), 2.38-2.90 (m, 7H), 3.05 (br s, 7H), 4.01-4.35 (m, 3H), 4.69-4.88 (m, 1H), 4.92-5.53 (m, 2H), 6.08-6.38 (m, 2H), 7.34 (t, J=7.4 Hz, 1H), 7.54 (t, J=8.1 Hz, 1H), 7.74 (d, J=8.7 Hz, 0.3H), 7.89 (d, J=9.0 Hz, 0.7H), 8.53 (d, J=8.3 Hz, 0.7H), 8.60 (d, J=9.8 Hz, 0.3H); LC/MS: m/z=534.3 [M+H]⁺.

ZA11: ¹H-NMR (300 MHz, CDCl₃-CD₃OD-DCl) δ: 1.40 (brs, 1H), 1.52-2.16 (m, 18H), 2.23 (br s, 2H), 2.36-3.10 (m, 8H), 3.24 (s, 0.3H), 3.41 (s, 0.7H), 4.04-4.31 (m, 3H), 4.64-4.72 (m, 0.6H), 4.83-5.06 (m, 2H), 5.25-5.34 (m, 0.4H), 5.82 (d, J=3.3 Hz, 0.7H), 5.90 (d, J=4.0 Hz, 0.3H), 6.10-6.27 (m, 1H), 7.35 (t, J=7.8 Hz, 1H), 7.55 (t, J=7.9 Hz, 1H), 7.69 (d, J=8.2 Hz, 0.4H), 7.94 (d, J=7.3 Hz, 0.6H), 8.54 (d, J=8.0 Hz, 0.6H), 8.59 (d, J=8.4 Hz, 0.4H); LC/MS: m/z=548.3 [M+H]⁺.

5.5 Example 5 In Vitro ORL-1 Receptor Binding Assay

ORL-1 Receptor Binding Assay Procedures: Membranes from recombinant HEK-293 cells expressing the human opioid receptor-like receptor (ORL-1) (Receptor Biology) were prepared by lysing cells in ice-cold hypotonic buffer (2.5 mM MgCl₂, 50 mM HEPES, pH 7.4) (10 mL/10 cm dish) followed by homogenization with a tissue grinder/Teflon pestle. Membranes were collected by centrifugation at 30,000×g for 15 min at 4° C. and pellets resuspended in hypotonic buffer to a final concentration 1-3 mg/mL. Protein concentrations were determined using the BioRad protein assay reagent with bovine serum albumen as a standard. Aliquots of the ORL-1 receptor membranes were stored at −80° C.

Radioligand binding assays (screening and dose-displacement) used 0.1 nM [³H]-nociceptin (NEN; 87.7 Ci/mmole) with 10-20 μg membrane protein in a final volume of 500 μL binding buffer (10 mM MgCl₂, 1 mM EDTA, 5% DMSO, 50 mM HEPES, pH 7.4). Non-specific binding was determined in the presence of 10 nM unlabeled nociceptin (American Peptide Company). All reactions were performed in 96-deep well polypropylene plates for 1 h at about 25° C. Binding reactions were terminated by rapid filtration onto 96-well Unifilter GF/C filter plates (Packard) presoaked in 0.5% polyethylenimine (Sigma-Aldrich). Harvesting was performed using a 96-well tissue harvester (Packard) followed by three filtration washes with 500 μL ice-cold binding buffer. Filter plates were subsequently dried at 50° C. for 2-3 hours. Fifty μL/well scintillation cocktail (BetaScint; Wallac) was added and plates were counted in a Packard Top-Count for 1 min/well. The data from screening and dose-displacement experiments were analyzed using Microsoft Excel and the curve fitting functions in GraphPad PRISM™, v. 3.0 or higher, respectively, or an in-house function for one-site competition curve-fitting.

ORL-1 Receptor Binding Data: An Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a binding affinity (K_(i)) for the human ORL-1 receptor of about 1000 nM or less in one embodiment, or about 500 nM or less in another embodiment. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a K_(i) (nM) of about 300 or less for binding to ORL-1 receptors. In one embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a K_(i) (nM) of about 100 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 35 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 20 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 15 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 10 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 4 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 1 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 0.4 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound of the disclosure has a K_(i) (nM) of about 0.1 or less.

5.6 Example 6 In Vitro ORL-1 Receptor Functional Assay

ORL-1 Receptor [³⁵S]GTPγS Binding Assay Procedures: Membranes from recombinant HEK-293 cells expressing the human opioid receptor-like (ORL-1) (Receptor Biology) were prepared by lysing cells in ice-cold hypotonic buffer (2.5 mM MgCl₂, 50 mM HEPES, pH 7.4) (10 mL/10 cm dish) followed by homogenization with a tissue grinder/Teflon pestle. Membranes were collected by centrifugation at 30,000×g for 15 min at 4° C., and pellets resuspended in hypotonic buffer to a final concentration of 1-3 mg/mL. Protein concentrations were determined using the BioRad protein assay reagent with bovine serum albumen as a standard. Aliquots of the ORL-1 receptor membranes were stored at −80° C.

Functional binding assays were conducted as follows. ORL-1 membrane solution was prepared by sequentially adding final concentrations of 0.066 μg/μL ORL-1 membrane protein, 10 μg/mL saponin, 3 μM GDP and 0.20 nM [³⁵S]GTPγS to binding buffer (100 mM NaCl, 10 mM MgCl₂, 20 mM HEPES, pH 7.4) on ice. The prepared membrane solution (190 μL/well) was transferred to 96-shallow well polypropylene plates containing 10 μL of 20× concentrated stock solutions of agonist/nociceptin prepared in DMSO. Plates were incubated for 30 min at about 25° C. with shaking. Reactions were terminated by rapid filtration onto 96-well Unifilter GF/B filter plates (Packard) using a 96-well tissue harvester (Packard) and followed by three filtration washes with 200 μL ice-cold binding buffer (10 mM NaH₂PO₄, 10 mM Na₂HPO₄, pH 7.4). Filter plates were subsequently dried at 50° C. for 2-3 hours. Fifty μL/well scintillation cocktail (BetaScint; Wallac) was added and plates were counted in Packard Top-Count for 1 min/well. Data are analyzed using the sigmoidal dose-response curve fitting functions in GraphPad PRISM v. 3.0 or higher, or an in-house function for non-linear, sigmoidal dose-response curve-fitting.

ORL-1 Receptor Functional Data: ORL-1 GTP EC₅₀ is the concentration of a compound providing 50% of the maximal response for the compound at an ORL-1 receptor. In one embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 5000 or less to stimulate ORL-1 receptor function. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 1000 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 100 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 80 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 50 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 35 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 15 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 10 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 4 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 1 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 0.4 or less. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP EC₅₀ (nM) of about 0.1 or less.

ORL-1 GTP Emax (%) is the maximal effect elicited by a compound relative to the effect elicited by nociceptin, a standard ORL-1 agonist. In one embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP Emax (%) of about 50% or greater. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP Emax (%) of about 75% or greater. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP Emax (%) of about 85% or greater. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP Emax (%) of about 95% or greater. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP Emax (%) of about 100% or greater. In another embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has an ORL-1 GTP Emax (%) of about 110% or greater. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound acting as a partial agonist has an ORL-1 GTP Emax (%) of less than about 10%. In one embodiment, partial agonist Azetidine-Substituted Quinoxaline-Type Piperidine Compounds has an ORL-1 GTP Emax (%) of less than about 20%. In another embodiment, partial agonist Azetidine-Substituted Quinoxaline-Type Piperidine Compounds has an ORL-1 GTP Emax (%) of less than about 30%. In another embodiment, partial agonist Azetidine-Substituted Quinoxaline-Type Piperidine Compounds has an ORL-1 GTP Emax (%) of less than about 40%. In another embodiment, partial agonist Azetidine-Substituted Quinoxaline-Type Piperidine Compounds has an ORL-1 GTP Emax (%) of less than about 50%.

5.7 Example 7 In Vitro Mu-Opioid Receptor Binding Assays

μ-Opioid Receptor Binding Assay Procedures: Radioligand binding assays were conducted using freshly thawed membranes expressing human μ-receptors (Perkin Elmer, Shelton, Conn.). Radioligand dose-displacement binding assays for human μ-opioid receptors used 0.2 nM [³H]-diprenorphine (NEN, Boston, Mass.), with 5-20 mg membrane protein/well in a final volume of 500 μL binding buffer (10 mM MgCl₂, 1 mM EDTA, 5% DMSO, 50 mM HEPES, pH 7.4). Reactions were carried out in the absence or presence of increasing concentrations of unlabeled naloxone. All reactions were conducted in 96-deep well polypropylene plates for 1-2 hr at about 25° C. Binding reactions were terminated by rapid filtration onto 96-well Unifilter GF/C filter plates (Packard, Meriden, Conn.) presoaked in 0.5% polyethylenimine using a 96-well tissue harvester (Brandel, Gaithersburg, Md.) followed by performing three filtration washes with 500 μL of ice-cold binding buffer. Filter plates were subsequently dried at 50° C. for 2-3 hours. BetaScint scintillation cocktail (Wallac, Turku, Finland) was added (50 μL/well), and plates were counted using a Packard Top-Count for 1 min/well. The data were analyzed using the one-site competition curve fitting functions in GraphPad PRISM v. 3.0 or higher (San Diego, Calif.), or an in-house function for one-site competition curve-fitting.

μ-Opioid Receptor Binding Data: In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a K_(i) (nM) of about 3000 or less for binding to μ-opioid receptors, or about 1000 or less, or about 650 or less, or about 525 or less, or about 250 or less, or about 100 or less, or about 10 or less, or about 1 or less, or about 0.1 or less.

5.8 Example 8 In Vitro Mu-Opioid Receptor Functional Assays

μ-Opioid Receptor Functional Assay Procedures: [³⁵S]GTPγS functional assays were conducted using freshly thawed membranes expressing human μ-receptors. Assay reactions were prepared by sequentially adding the following reagents to binding buffer (100 mM NaCl, 10 mM MgCl₂, 20 mM HEPES, pH 7.4) on ice (final concentrations indicated): membrane protein (0.026 mg/mL), saponin (10 mg/mL), GDP (3 mM) and [³⁵S]GTPγS (0.20 nM; NEN). The prepared membrane solution (190 μL/well) was transferred to 96-shallow well polypropylene plates containing 10 μL of 20× concentrated stock solutions of the agonist DAMGO ([D-Ala2, N-methyl-Phe4 Gly-o15]-enkephalin) prepared in dimethyl sulfoxide (DMSO). Plates were incubated for 30 min at about 25° C. with shaking. Reactions were terminated by rapid filtration onto 96-well Unifilter GF/B filter plates (Packard, Meriden, Conn.) using a 96-well tissue harvester (Brandel, Gaithersburg, Md.) followed by three filtration washes with 200 μL of ice-cold wash buffer (10 mM NaH₂PO₄, 10 mM Na₂HPO₄, pH 7.4). Filter plates were subsequently dried at 50° C. for 2-3 hr. BetaScint scintillation cocktail (Wallas, Turku, Finland) was added (50 μL/well) and plates were counted using a Packard Top-Count for 1 min/well. Data were analyzed using the sigmoidal dose-response curve fitting functions in GraphPad PRISM v. 3.0 or higher, or an in-house function for non-linear, sigmoidal dose-response curve-fitting.

μ-Opioid Receptor Functional Data: μ GTP EC₅₀ is the concentration of a compound providing 50% of the maximal response for the compound at a μ-opioid receptor. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a μ GTP EC₅₀ (nM) of about 5000 or less, or about 4100 or less, or about 3100 or less, or about 2000 or less, or about 1000 or less, or about 100 or less, or about 10 or less, or about 1 or less, or about 0.4 or less, or about 0.1 or less.

μ GTP Emax (%) is the maximal effect elicited by a compound relative to the effect elicited by DAMGO, a standard μ agonist. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a μ GTP Emax (%) of about 10% or greater, or about 20% or greater, or about 50% or greater, or about 65% or greater, or about 75% or greater, or about 88% or greater, or about 100% or greater. In other embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a μ GTP Emax (%) of about 10% or less, or about 5% or less, or about 2% or less.

5.9 Example 9 In Vitro Kappa-Opioid Receptor Binding Assays

κ-Opioid Receptor Binding Assay Procedures: Membranes from recombinant HEK-293 cells expressing the human kappa opioid receptor (kappa) (cloned in house) were prepared by lysing cells in ice cold hypotonic buffer (2.5 mM MgCl₂, 50 mM HEPES, pH 7.4) (10 mL/10 cm dish) followed by homogenization with a tissue grinder/Teflon pestle. Membranes were collected by centrifugation at 30,000×g for 15 min at 4° C. and pellets resuspended in hypotonic buffer to a final concentration of 1-3 mg/mL. Protein concentrations were determined using the BioRad protein assay reagent with bovine serum albumen as a standard. Aliquots of kappa receptor membranes were stored at −80° C.

Radioligand dose displacement assays used 0.4-0.8 nM [³H]-U69,593 (NEN; 40 Ci/mmole) with 10-20 μg membrane protein (recombinant kappa opioid receptor expressed in HEK 293 cells; in-house prep) in a final volume of 200 μL binding buffer (5% DMSO, 50 mM Trizma base, pH 7.4). Non-specific binding was determined in the presence of 10 μM unlabeled naloxone or U69,593. All reactions were performed in 96-well polypropylene plates for 1 h at a temperature of about 25° C. Binding reactions were determined by rapid filtration onto 96-well Unifilter GF/C filter plates (Packard) presoaked in 0.5% polyethylenimine (Sigma-Aldrich). Harvesting was performed using a 96-well tissue harvester (Packard) followed by five filtration washes with 200 μL ice-cold binding buffer. Filter plates were subsequently dried at 50° C. for 1-2 hours. Fifty μL/well scintillation cocktail (MicroScint20, Packard) was added and plates were counted in a Packard Top-Count for 1 min/well.

κ-Opioid Receptor Binding Data: In one embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has substantially no activity at a κ-opioid receptor. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a Ki (nM) of about 20,000 or less, or about 10,000 or less, or about 5000 or less, or about 500 or less, or about 300 or less, or about 100 or less, or about 50 or less, or about 20 or less, or about 15 or less, or about 10 or less.

5.10 Example 10 In Vitro Kappa-Opioid Receptor Functional Assays

κ-Opioid Receptor Functional Assay Procedures: Functional [³⁵S]GTPγS binding assays were conducted as follows. Kappa opioid receptor membrane solution was prepared by sequentially adding final concentrations of 0.026 μg/μL kappa membrane protein (in-house), 10 μg/mL saponin, 3 μM GDP and 0.20 nM [³⁵S]GTPγS to binding buffer (100 mM NaCl, 10 mM MgCl₂, 20 mM HEPES, pH 7.4) on ice. The prepared membrane solution (190 μL/well) was transferred to 96-shallow well polypropylene plates containing 10 μL of 20× concentrated stock solutions of agonist prepared in DMSO. Plates were incubated for 30 min at a temperature of about 25° C. with shaking. Reactions were terminated by rapid filtration onto 96-well Unifilter GF/B filter plates (Packard) using a 96-well tissue harvester (Packard) and followed by three filtration washes with 200 μL ice-cold binding buffer (10 mM NaH₂PO₄, 10 mM Na₂HPO₄, pH 7.4). Filter plates were subsequently dried at 50° C. for 2-3 hours. Fifty μL/well scintillation cocktail (MicroScint20, Packard) was added and plates were counted in a Packard Top-Count for 1 min/well.

κ-Opioid Receptor Functional Data: κ GTP EC₅₀ is the concentration of a compound providing 50% of the maximal response for the compound at a κ-opioid receptor. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a κ GTP EC₅₀ (nM) of about 20,000 or less, or about 10,000 or less, or about 5000 or less, or about 2000 or less, or about 1500 or less, or about 800 or less, or about 500 or less, or about 300 or less, or about 100 or less, or about 50 or less, or about 10 or less.

κ GTP Emax (%) is the maximal effect elicited by a compound relative to the effect elicited by U69,593. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a κ GTP Emax (%) of about 10% or greater, or about 15% or greater, or about 30% or greater, or about 40% or greater, or about 45% or greater, or about 75% or greater, or about 90% or greater, or about 100% or greater. In other embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a κ GTP Emax (%) of about 10% or less, or about 5% or less, or about 2% or less.

5.11 Example 11 In Vitro Delta-Opioid Receptor Binding Assays

δ-Opioid Receptor Binding Assay Procedures: Radioligand dose-displacement assays used 0.2 nM [³H]-Naltrindole (NEN; 33.0 Ci/mmole) with 10-20 μg membrane protein (recombinant delta opioid receptor expressed in CHO-K1 cells; Perkin Elmer) in a final volume of 500 μL binding buffer (5 mM MgCl₂, 5% DMSO, 50 mM Trizma base, pH 7.4). Non-specific binding was determined in the presence of 25 μM unlabeled naloxone. All reactions were performed in 96-deep well polypropylene plates for 1 h at a temperature of about 25° C. Binding reactions were determined by rapid filtration onto 96-well Unifilter GF/C filter plates (Packard) presoaked in 0.5% polyethylenimine (Sigma-Aldrich). Harvesting was performed using a 96-well tissue harvester (Packard) followed by five filtration washes with 500 μL ice-cold binding buffer. Filter plates were subsequently dried at 50° C. for 1-2 hours. Fifty μL/well scintillation cocktail (MicroScint20, Packard) was added and plates were counted in a Packard Top-Count for 1 min/well.

δ-Opioid Receptor Binding Data: In one embodiment, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has substantially no activity at a δ-opioid receptor. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a Ki (nM) of about 20,000 or less, or about 10,000 or less, or about 7500 or less, or about 6500 or less, or about 5000 or less, or about 3000 or less, or about 2500 or less, or about 1000 or less, or about 500 or less, or about 350 or less, or about 250 or less, or about 100 or less, or about 10 or less.

5.12 Example 12 In Vitro Delta-Opioid Receptor Functional Assays

δ-Opioid Receptor Functional Assay Procedures: Functional [³⁵S]GTPγS binding assays were conducted as follows using membranes expressing human δ-opioid receptors. Delta opioid receptor membrane solution was prepared by sequentially adding final concentrations of 0.026 μg/μL delta membrane protein (Perkin Elmer), 10 μg/mL saponin, 3 μM GDP and 0.20 nM [³⁵S]GTPγS to binding buffer (100 mM NaCl, 10 mM MgCl₂, 20 mM HEPES, pH 7.4) on ice. The prepared membrane solution (190 μL/well) was transferred to 96-shallow well polypropylene plates containing 10 μL of 20× concentrated stock solutions of agonist prepared in DMSO. Plates were incubated for 30 min at a temperature of about 25° C. with shaking. Reactions were terminated by rapid filtration onto 96-well Unifilter GF/B filter plates (Packard) using a 96-well tissue harvester (Packard) and followed by three filtration washes with 200 μL ice-cold binding buffer (10 mM NaH₂PO₄, 10 mM Na₂HPO₄, pH 7.4). Filter plates were subsequently dried at 50° C. for 1-2 hours. Fifty μL/well scintillation cocktail (MicroScint20, Packard) was added and plates were counted in a Packard Top-count for 1 min/well.

δ-Opioid Receptor Functional Data: δ GTP EC₅₀ is the concentration of a compound providing 50% of the maximal response for the compound at a δ receptor. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a δ GTP EC₅₀ (nM) of about 20,000 or less, or about 10,000 or less, or about 100 or less, or about 1000 or less, or about 90 or less, or about 50 or less, or about 25 or less, or about 10 or less.

δ GTP Emax (%) is the maximal effect elicited by a compound relative to the effect elicited by met-enkephalin. In certain embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a δ GTP Emax (%) of about 10% or greater, or about 30% or greater, or about 50% or greater, or about 75% or greater, or about 90% or greater, or about 100% or greater, or about 110% or greater. In other embodiments, an Azetidine-Substituted Quinoxaline-Type Piperidine Compound has a δ GTP Emax (%) of about 10% or less, or about 5% or less, or about 2% or less.

5.13 Example 13 Efficacy of Receptor Binding and Activity Response

The following Tables provide, for several Azetidine-Substituted Quinoxaline-Type Piperidine Compounds and certain other compounds of interest, results on the efficacy of binding and activity response to the ORL-1 receptor, the mu-opioid receptor, the kappa-opioid receptor, and/or the delta-opioid receptor.

In Table 14, binding efficacy to the ORL-1 receptor was determined by the procedure in Example 5. Binding efficacy to the mu-opioid receptor was determined by the procedure in Example 7. Binding efficacy to the kappa-opioid receptor was determined by the procedure in Example 9. Binding efficacy to the delta-opioid receptor was determined by the procedure in Example 11.

In Table 15, activity response to the ORL-1 receptor was determined by the procedure in Example 6. Activity response to the mu-opioid receptor was determined by the procedure in Example 8. Activity response to the kappa-opioid receptor was determined by the procedure in Example 10. Activity response to the delta-opioid receptor can be determined by the procedure in Example 12.

TABLE 14 Efficacy of Receptor Binding of Azetidine-Substituted Quinoxaline- Type Piperidine Compounds and Certain Other Compounds of Interest K_(i) [Average ± Std Deviation] (nM) Opioid Receptor Ref. No. Compound ORL-1 Mu Kappa Delta A11a(i)

43 ± 10 502 ± 170 323 ± 30  3050 ± 110  A11a(ii)

19.2 ± 2.8  219 ± 5  116 ± 32     11500 B2a(i)

93.5 ± 7.3  — — — B2a(ii)

27.1 ± 1.9  500 ± 27  289 ± 24  >20,000 B11a(i)

9.8 ± 1.1 — — — B11a(ii)

12.1 ± 1.9  48.9 ± 3.6  40.8 ± 2.5  8000 ± 3320 B12a

2.21 ± 0.06 29.1 ± 3.2  113 ± 13  2620 ± 63  B20a(i)

0.89 ± 0.17 38.9 ± 9.5  137 ± 18  3440 ± 650  B20a(ii)

7.44 ± 0.52 154 ± 21  159 ± 38  3920 ± 340  B21a

8.22 ± 1.32 54.1 ± 6.4  111.4 ± 3.7  1516 ± 93  B34a

1.03 ± 0.10 43.4 ± 5.3  72.3 ± 9.1  3990 ± 440  C2a(ii)

294 ± 63  — — — C20a(ii)

55.5 ± 4.1  2830 ± 77  7050 ± 1350 7670 ± 610  C21a

381 ± 60  — — — C39a

264 ± 18  — — — E53a(i)

80 ± 14 3420 ± 840  128 ± 29  1770 ± 180  E53a(ii)

23.6 ± 1.4  — 274 ± 20  4860 ± 150  E54a

5.46 ± 0.49 744 ± 55  1770 ± 580  1510 ± 330  H3a

9.93 ± 1.26 — — — K2b(ii)

1.46 ± 0.06 259 ± 49  223 ± 46     15400 K29b

2.64 ± 0.15 494 ± 21  135 ± 13  4470 ± 1660 L2b(i)

3.07 ± 0.15 136 ± 8  188 ± 77  6410 ± 410  L2b(ii)

3.78 ± 0.94 128 ± 12  86 ± 13    12500 L29b

1.32 ± 0.08 — — — ZA01

0.22 ± 0.03 — — — ZA02

3.14 ± 0.16 — — — ZA03

0.34 ± 0.05 — — — ZA04

1.98 ± 0.17 83 ± 20 11.6 ± 3.1  >20,000 ZA05

1.97 ± 0.23 57 ± 19 7.4 ± 0.8 >20,000 ZA06

1.98 ± 0.39 — — — ZA07

3.56 ± 0.45 — — — ZA08

11.9 ± 1.7  — — — ZA09

11.9 ± 1.5  — — — ZA10

23.0 ± 2.3  — — — ZA11

39.9 ± 5.8  — — — CC01

 98 919 38 — CC02

 15  86 51 — CC03

511 — — — CC04

272 — — —

TABLE 15 Activity Response of Azetidine-Substituted Quinoxaline-Type Piperidine Compounds GTPγS (EC₅₀: nM, Emax: %) [mean ± SEM] Opioid Receptor ORL-1 Mu Kappa Ref. No. EC₅₀ E_(max) EC₅₀ E_(max) EC₅₀ A11a(i) 139 ± 17  38.7 ± 3.5 357 ± 27 19.7 ± 0.9 >20,000 A11a(ii) 42.5 ± 4.8  47.3 ± 4.8 116 ± 13 36.7 ± 5.8 >20,000 B2a(i) 319 ± 28  27.3 ± 1.7 — — — B2a(ii) 61.3 ± 6.9  29.0 ± 0.9 247 ± 21 12.0 ± 2.1 >20,000 B11a(i) 16.2 ± 1.6  24.0 ± 0.6 — — — B11a(ii) 6.54 ± 0.83 61 ± 5 >20,000 — >20,000 B12a 8.14 ± 0.93 29.3 ± 3.0 >20,000 — >20,000 B20a(i) 2.62 ± 0.18 35.3 ± 3.8 54 ± 21 34.3 ± 6.8 >20,000 B20a(ii) 51.1 ± 4.9  51.3 ± 0.3 363 ± 127 30.3 ± 1.7 >20,000 B21a 7.8 ± 0.9 44.0 ± 4.0 64 ± 27 41.3 ± 4.1 — B34a 1.24 ± 0.28 26.0 ± 2.5 >20,000 — >20,000 C20a(ii) 146 ± 7  50.3 ± 6.4 — — — E53a(i) 65.7 ± 12.6 51.3 ± 5.8 — — >20,000 E53a(ii) 129.7 ± 4.7  53.7 ± 3.8 568 ± 149 25.3 ± 1.8 >20,000 E54a 21.7 ± 3.0  58.3 ± 4.5 560 ± 203 67.7 ± 2.9 >20,000 H3a 40.1 ± 3.8  103.0 ± 2.1  — — — K2b(ii) 14.3 ± 4.7  50.3 ± 4.4 340 ± 4  23.3 ± 0.3 >20,000 K29b 7.24 ± 0.06 47.3 ± 2.2 >20,000 — >20,000 L2b(i) 14.6 ± 1.2  29.0 ± 0.6 469 ± 110  9.0 ± 0.6 >20,000 L2b(ii) 12.0 ± 2.5  41.0 ± 0.6 >20,000 — >20,000 L29b 4.2 ± 0.4 23.7 ± 2.0 — — — ZA01 >20,000 — — — — ZA02 24.2 ± 4.2  19.75 ± 0.48 — — — ZA03 >20,000 1.0 — — — ZA04 5.84 ± 0.73 25.67 ± 1.45 >20,000 — >20,000 ZA05 24.5 ± 1.9  28.7 ± 1.2 >20,000 — >20,000 ZA06 >20,000 — — — — ZA07 22.9 ± 2.5  24 ± 1 — — — ZA08 29.3 ± 3.9  22.3 ± 1.0 — — — ZA09 >20,000 — — — — ZA10 >20,000 — — — — ZA11 >20,000 — — — —

5.14 Example 14 In Vitro Assay of Metabolic Stability of Azetidine-Substituted Quinoxaline-Type Piperidine Compounds

The extent of in vitro metabolic stability of several Azetidine-Substituted Quinoxaline-Type Piperidine Compounds was determined upon exposure to human liver microsomes or rat liver microsomes. Liver microsomes from Crj;CD rats or humans were incubated with 2 μM of each tested Azetidine-Substituted Quinoxaline-Type Piperidine Compound; thereafter, the supernatant was analyzed by HPLC/MS for the concentration of the tested compound present.

Human liver microsomes, pooled, 20 mg/mL, were obtained from XenoTech LLC (Lexena, Kans., cat# H0610). Rat liver microsomes were obtained from 8-week-old Crj:CD (SD) male rats. Alternatively and if desired, rat liver microsomes can be obtained commercially from, e.g., XenoTech (Sprague-Dawley rat liver microsomes, pooled, 20 mg/mL, cat# R1000). β-NADPH (β-nicotinamide adenine dinucleotide T-phosphate reduced tetrasodium salt hydrate) was obtained from Oriental Yeast Co., Ltd. (Tokyo, Japan).

Each tested Azetidine-Substituted Quinoxaline-Type Piperidine Compound or other compound of interest, present at a concentration of 2 μM, was incubated at 37° C. in the presence of 0.5 mg/mL of either human microsomes or rat microsomes in suspension in 50 mM Tris-HCl buffer (7.4 pH), 150 mM KCl, 10 mM MgCl₂, and 1 mM β-NADPH. Incubation was initiated upon the addition of a 100-fold concentrated solution of the tested compound to one of the microsome preparations. Incubation was terminated by addition of a two-fold volume of a 1/1 mixture of MeCN/MeOH after either 0 minutes or 30 minutes of incubation at 37° C. Thereafter, proteins and other macromolecules from the microsome preparation were removed by centrifugation. All incubations were conducted in duplicate.

The mean tested compound concentration was determined after 0 minutes or 30 minutes of incubation using an HPLC/MS apparatus. The HPLC system consisted of a Waters 2795 Separations Module (Waters Corp., Milford, Mass.) equipped with an inline degasser, temperature controlled auto-sampler, and column oven. The analytical column was a Waters Atlantis C18 3.5 μm, 2.1 mm×20 mm column. The mass analyzer was a Waters ZQ, single quadrupole mass spectrometer equipped with an electrospray ionization source (ESI) operating in the positive ionization mode and utilizing a stainless steel spray capillary.

A 5 μL volume of the supernatant obtained after each incubation was injected into the above-described reverse-phase column maintained at a temperature of about 25° C. and eluted using a solvent gradient (solvent A is 0.1% aqueous formic acid, solvent B is MeCN). The HPLC elution conditions were as follows: 5% of solvent B (with the balance solvent A); followed by a linear gradient to 90% of solvent B in 0.1 min; followed by 90% of solvent B for 2.9 min; followed by a gradient to 5% of solvent B in 0.1 min. The column was then equilibrated with 5%/95% of solvent B/solvent A for 1.5 min before the next injection. The flow rate was kept constant at 0.4 mL/min. The MS was operated in the selected ion recording (SIR) mode. The capillary energy and cone energy were 1.5-2.5 kV and 20-40V, respectively.

The percentage of tested compound remaining after 30 minutes of incubation in the presence of either human liver microsomes or rat liver microsomes was calculated from the determinations of the mean tested compound concentration after 0 minutes and 30 minutes of incubation. These results, for several Azetidine-Substituted Quinoxaline-Type Piperidine Compounds and certain other compounds of interest, are shown in Table 16.

TABLE 16 In Vitro Metabolic Stability and Free Unbound Percentages of Azetidine-Substituted Quinoxaline-Type Piperidine Compounds Relative to Certain Other Compounds of Interest Free Un- bound Metabolic Drug Ref. Stability (%) Fraction No. Compound  d  Rat Human (%) B2a(ii) CC01

1 2 100 100  94   100   — — B20a(ii) CC02

1 2  84  97  70    58   3.3 1.2 C2a(ii) CC03

1 2  86  33  67    60   — — C20a(ii) CC04

1 2  62  14  6.5  21   — —

As can be noted from the results in Table 16, for three “pairs” of compounds the metabolic stability upon exposure to one source of liver microsomes is significantly reduced for the “d=2” compound relative to the counterpart “d=1” Azetidine-Substituted Quinoxaline-Type Piperidine Compound. For example, the metabolic stability of Compound CC02 upon exposure to human liver microsomes, i.e., the amount of the compound remaining after 30 minutes of incubation relative to the initial amount present after 0 minutes of incubation (expressed as a percentage of the initial amount) is only 58%. In contrast, the metabolic stability of Azetidine-Substituted Quinoxaline-Type Piperidine Compound B20a(ii) upon exposure to human liver microsomes is much greater: 70%. In another example, the metabolic stability of Compound CC03 upon exposure to rat liver microsomes is only 33%. In contrast, the metabolic stability of Azetidine-Substituted Quinoxaline-Type Piperidine Compound C2a(ii) upon exposure to rat liver microsomes, 86%, is 2.6 times greater (86%/33%). In a further example, the metabolic stability of Compound CC04 upon exposure to rat liver microsomes is only 14%. In contrast, the metabolic stability of Azetidine-Substituted Quinoxaline-Type Piperidine Compound C20a(ii) upon exposure to rat liver microsomes, 62%, is over 4.4 times greater (62%/14%). Based on these in vitro results, it is believed that Azetidine-Substituted Quinoxaline-Type Piperidine Compounds are effective in resisting metabolism by the liver in vivo and, thus, more effective in ORL-1 receptor modulation.

5.15 Example 15 In Vitro Assay of Free Unbound Azetidine-Substituted Quinoxaline-Type Piperidine Compounds

The extent of in vitro binding of Azetidine-Substituted Quinoxaline-Type Piperidine Compound B20a(ii) to rat serum was determined as an assessment of the availability of free unbound compound for modulating receptor activity. Serum from rats containing a tested compound in one chamber of a dialysis cell was dialyzed with phosphate buffered saline (PBS) in the other chamber; thereafter, the supernatant from each chamber was analyzed for the concentration of the tested compound present.

0.5 mg/kg of each tested Azetidine-Substituted Quinoxaline-Type Piperidine Compound or other compound of interest was solubilized in 1/1 N,N-dimethylacetamide/1,2-propane diol. Control rat serum was obtained as the supernatant product after coagulation and centrifugation (3000 rpm for 10 min at 4° C.) of whole blood taken via cannula inserted into the jugular vein of rats (Crl:CD (SD), male, fed). 50 μL of each tested compound solution was added to 1.2 mL of control rat serum. The final concentration of each tested compound in the serum sample was adjusted to 2 μg/mL by adding an appropriate volume of PBS. A cell suitable for equilibrium dialysis was used in the determinations. A SPECTRA/POR dialysis membrane (with molecular mass cutoff of 12,000-14,000 Da, Spectrum Laboratories, Inc., Rancho Dominguez, Calif.) separated the dialysis cell into two chambers. A 500 μL aliquot of the serum sample containing a tested compound was applied to one chamber (serum chamber) of the dialysis cell. A 500 μL aliquot of phosphate buffered saline (PBS) was applied to the other chamber (PBS chamber) of the dialysis cell. The dialysis study was conducted in duplicate for each tested compound.

After 24 h of equilibrium dialysis at 37° C., 30 μL of liquid from the serum chamber of the dialysis cell was collected and to this was added 270 μL of fresh PBS (this combination was designated Sample “A”). Then, 270 μL of liquid from the PBS chamber of the dialysis cell was collected and to this was added 30 μL of control rat serum (this combination was designated Sample “B”). A 5-10 fold volume of MeOH was added to each of Samples A and B. Thereafter, each was mixed vigorously with the MeOH and then centrifuged (3000 rpm for 10 min at 4° C.). Each supernatant was analyzed by liquid chromatography with tandem mass spectrometry detection (LC-MS/MS).

For each tested compound, the mean amount of tested compound present in each of Samples A and B was determined from the peak areas obtained via LC-MS/MS analysis. Thereafter, the percentage of free unbound tested compound was calculated from the ratio of the tested compound amount determined from Sample B divided by the sum of the tested compound amounts determined from Sample A and Sample B. These results, for Azetidine-Substituted Quinoxaline-Type Piperidine Compound B20a(ii) and another compound of interest, CC02, are shown in Table 16.

As can be noted from the results in Table 16 for the above “pair” of compounds, the free unbound drug fraction is significantly lower for the “d=2” compound relative to the counterpart “d=1” Azetidine-Substituted Quinoxaline-Type Piperidine Compound. Specifically, the free unbound drug fraction of Azetidine-Substituted Quinoxaline-Type Piperidine Compound B20a(ii) is 3.3%. In contrast, the free unbound drug fraction of Compound CC02 is only 1.2%. Thus, the amount of Azetidine-Substituted Quinoxaline-Type Piperidine Compound B20a(ii) available for, inter alia, receptor modulation, is over 2.7 times greater (3.3%/1.2%).

5.16 Example 16 In Vivo Assays for Prevention or Treatment of Pain

Test Animals Each experiment used rats weighing between 200-260 g at the start of the experiment. The rats were group-housed and had free access to food and water at all times, except prior to oral administration of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound when food was removed for 16 hours before dosing. A control group acted as a comparison to rats treated with an Azetidine-Substituted Quinoxaline-Type Piperidine Compound. The control group was administered the carrier for the Azetidine-Substituted Quinoxaline-Type Piperidine Compound. The volume of carrier administered to the control group was the same as the volume of carrier and Azetidine-Substituted Quinoxaline-Type Piperidine Compound administered to the test group.

Acute Pain To assess the actions of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound for the treatment or prevention of acute pain, the rat tail flick test can be used. Rats are gently restrained by hand and the tail exposed to a focused beam of radiant heat at a point 5 cm from the tip using a tail flick unit (Model 7360, commercially available from Ugo Basile of Italy). Tail flick latencies are defined as the interval between the onset of the thermal stimulus and the flick of the tail. Animals not responding within 20 seconds are removed from the tail flick unit and assigned a withdrawal latency of 20 seconds. Tail flick latencies are measured immediately before (pre-treatment) and 1, 3, and 5 hours following administration of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound. Data are expressed as tail flick latency(s) and the percentage of the maximal possible effect (% MPE), i.e., 20 seconds, is calculated as follows:

${\%\mspace{14mu}{MPE}} = {\frac{\left\lbrack {\left( {{post}\mspace{14mu}{administration}\mspace{14mu}{latency}} \right) - \left( {{pre}\text{-}{administration}\mspace{14mu}{latency}} \right)} \right\rbrack}{\left( {20\mspace{11mu} s\mspace{14mu}{pre}\text{-}{administration}\mspace{14mu}{latency}} \right)} \times 100}$

The rat tail flick test is described in D'Amour et al., “A Method for Determining Loss of Pain Sensation,” J. Pharmacol. Exp. Ther. 72:74-79 (1941).

Inflammatory Pain: To assess the actions of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound for the treatment or prevention of inflammatory pain, the Freund's complete adjuvant (“FCA”) model of inflammatory pain can be used. FCA-induced inflammation of the rat hind paw is associated with the development of persistent inflammatory mechanical hyperalgesia and provides reliable prediction of the anti-hyperalgesic action of clinically useful analgesic drugs (Bartho et al., “Involvement of capsaicin-sensitive neurons in hyperalgesia and enhanced opioid antinociception in inflammation,” Naunyn-Schmiedeberg's Archives of Pharmacol. 342:666-670 (1990)). The left hind paw of each animal is administered a 50 μL intraplantar injection of 50% FCA. 24 hour post injection, the animal is assessed for response to noxious mechanical stimuli by determining the PWT, as described below. Rats are then administered a single injection of 1, 3, 10 or 30 mg/kg of either an Azetidine-Substituted Quinoxaline-Type Piperidine Compound; 30 mg/kg of a control selected from Celebrex, indomethacin, and naproxen; or carrier. Responses to noxious mechanical stimuli are then determined 1, 3, 5 and 24 hours post administration. Percentage reversal of hyperalgesia for each animal is defined as:

${\%\mspace{14mu}{Reversal}} = {\frac{\left\lbrack {\left( {{post}\mspace{14mu}{administration}\mspace{14mu}{PWT}} \right) - \left( {{pre}\text{-}{administration}{\mspace{11mu}\;}{PWT}} \right)} \right\rbrack}{\left\lbrack {\left( {{baseline}\mspace{14mu}{PWT}} \right) - \left( {{pre}\text{-}{administration}{\mspace{11mu}\;}{PWT}} \right)} \right\rbrack} \times 100}$

Neuropathic Pain: To assess the actions of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound for the treatment or prevention of neuropathic pain, either the Seltzer model or the Chung model can be used.

In the Seltzer model, the partial sciatic nerve ligation model of neuropathic pain was used to produce neuropathic hyperalgesia in rats (Seltzer et al., “A Novel Behavioral Model of Neuropathic Pain Disorders Produced in Rats by Partial Sciatic Nerve Injury,” Pain 43:205-218 (1990)). Partial ligation of the left sciatic nerve was performed under isoflurane/O₂ inhalation anaesthesia. Following induction of anesthesia, the left thigh of the rat was shaved and the sciatic nerve exposed at high thigh level through a small incision and was carefully cleared of surrounding connective tissues at a site near the trocanther just distal to the point at which the posterior biceps semitendinosus nerve branches off of the common sciatic nerve. A 7-0 silk suture was inserted into the nerve with a ⅜ curved, reversed-cutting mini-needle and tightly ligated so that the dorsal ⅓ to ½ of the nerve thickness was held within the ligature. The wound was closed with a single muscle suture (4-0 nylon (Vicryl)) and vetbond tissue glue. Following surgery, the wound area was dusted with antibiotic powder. Sham-treated rats underwent an identical surgical procedure except that the sciatic nerve was not manipulated. Following surgery, animals were weighed and placed on a warm pad until they recovered from anesthesia. Animals were then returned to their home cages until behavioral testing began. The animal was assessed for response to noxious mechanical stimuli by determining PWT for the rear paw of the animal, as described below, prior to surgery (baseline) then immediately prior to and 1, 3, 5, and 7 hours after oral drug-in-vehicle administration. Percentage reversal of neuropathic hyperalgesia at each of the specified times after administration was defined as:

${\%\mspace{14mu}{Reversal}} = {\frac{\left\lbrack {\left( {{post}\mspace{14mu}{administration}\mspace{14mu}{PWT}} \right) - \left( {{pre}\text{-}{administration}{\mspace{11mu}\;}{PWT}} \right)} \right\rbrack}{\left\lbrack {\left( {{baseline}\mspace{14mu}{PWT}} \right) - \left( {{pre}\text{-}{administration}{\mspace{11mu}\;}{PWT}} \right)} \right\rbrack} \times 100}$ Additionally, 10 mg/kg of pregabalin, an anticonvulsant accepted for relief of particular neuropathic pain, and the vehicle alone (0.5% methylcellulose in aqueous solution) were administered as controls. Eight rats that underwent partial ligation of the left sciatic nerve were used for each treatment group except for pregabalin, where six rats were treated. The results for administration of Azetidine-Substituted Quinoxaline-Type Piperidine Compound L2b(ii) are provided in Table 17.

TABLE 17 Neuropathic Pain Relief after Administration of an Azetidine-Substituted Quinoxaline-Type Piperidine Compound % Reversal [mean ± SEM] Time after Azetidine-Substituted Quinoxaline-Type Administration Piperidine Compound L2b(ii) Pregabalin Vehicle (hours) 1 mg/kg 3 mg/kg 10 mg/kg 10 mg/kg 2 mL/kg Pre-administration 0 0 0 0 0 1 37.5 ± 10.2 39.0 ± 6.3 39.3 ± 7.6  23.4 ± 0.6  −5.7 ± 3.1 3 42.5 ± 7.6  46.8 ± 5.7 42.4 ± 7.0  23.9 ± 7.5  −5.4 ± 3.1 5 39.4 ± 10.4 34.1 ± 6.5 33.1 ± 12.8 30.0 ± 6.1  −0.9 ± 2.6 7 33.7 ± 7.7  25.7 ± 6.5 29.5 ± 5.1  17.9 ± 10.1   1.2 ± 1.9 Additionally, eight rats that underwent sham surgery were used for each treatment group described in Table 17; the % reversal results at 1, 3, 5, or 7 hours after administration ranged from a low of 71.1% reversal (±2.2; vehicle after 1 hr) to a high of 95.3% reversal (±2.9; 3 mg/kg Azetidine-Substituted Quinoxaline-Type Piperidine Compound L2b(ii) after 3 hrs).

As demonstrated by the results in Table 17, administration of 1, 3, or 10 mg/kg of Azetidine-Substituted Quinoxaline-Type Piperidine Compound L2b(ii) provided more effective reversal than the pregabalin control at all the measured time-points following administration. Thus, Azetidine-Substituted Quinoxaline-Type Piperidine Compounds are effective in relieving neuropathic pain in vivo.

In the Chung model, the spinal nerve ligation model of neuropathic pain is used to produce mechanical hyperalgesia, thermal hyperalgesia and tactile allodynia in rats. Surgery is performed under isoflurane/O₂ inhalation anaesthesia. Following induction of anaesthesia, a 3 cm incision is made and the left paraspinal muscles are separated from the spinous process at the L₄-S₂ levels. The L₆ transverse process is carefully removed with a pair of small rongeurs to identify visually the L₄-L₆ spinal nerves. The left L₅ (or L₅ and L₆) spinal nerve(s) is isolated and tightly ligated with silk thread. A complete hemostasis is confirmed and the wound is sutured using non-absorbable sutures, such as nylon sutures or stainless steel staples. Sham-treated rats undergo an identical surgical procedure except that the spinal nerve(s) is not manipulated. Following surgery animals are weighed, administered a subcutaneous (s.c.) injection of saline or ringers lactate, the wound area is dusted with antibiotic powder and they are kept on a warm pad until they recover from the anesthesia. Animals are then returned to their home cages until behavioral testing begins. The animals are assessed for response to noxious mechanical stimuli by determining PWT, as described below, prior to surgery (baseline), then immediately prior to and 1, 3, and 5 hours after being administered an Azetidine-Substituted Quinoxaline-Type Piperidine Compound for the left rear paw of the animal. The animal can also be assessed for response to noxious thermal stimuli or for tactile allodynia, as described below. The Chung model for neuropathic pain is described in Kim, “An Experimental Model for Peripheral Neuropathy Produced by Segmental Spinal Nerve Ligation in the Rat,” Pain 50(3):355-363 (1992).

Response to Mechanical Stimuli as an Assessment of Mechanical Hyperalgesia: The paw pressure assay can be used to assess mechanical hyperalgesia. For this assay, hind paw withdrawal thresholds (PWT) to a noxious mechanical stimulus are determined using an analgesymeter (Model 7200, commercially available from Ugo Basile of Italy) as described in Stein, “Unilateral Inflammation of the Hindpaw in Rats as a Model of Prolonged Noxious Stimulation: Alterations in Behavior and Nociceptive Thresholds,” Pharmacol. Biochem. Behavior 31:451-455 (1988). The maximum weight that could be applied to the hind paw is set at 250 g and the end point is taken as complete withdrawal of the paw. PWT is determined once for each rat at each time point and either only the affected (ipsilateral) paw is tested, or both the ipsilateral and contralateral (non-injured) paw are tested.

Response to Thermal Stimuli as an Assessment of Thermal Hyperalgesia: The plantar test can be used to assess thermal hyperalgesia. For this test, hind paw withdrawal latencies to a noxious thermal stimulus are determined using a plantar test apparatus (commercially available from Ugo Basile of Italy) following the technique described by Hargreaves et al., “A New and Sensitive Method for Measuring Thermal Nociception in Cutaneous Hyperalgesia,” Pain 32(1):77-88 (1988). The maximum exposure time is set at 32 seconds to avoid tissue damage and any directed paw withdrawal from the heat source is taken as the end point. Three latencies are determined at each time point and averaged. Either only the affected (ipsilateral) paw is tested, or both the ipsilateral and contralateral (non-injured) paw are tested.

Assessment of Tactile Allodynia: To assess tactile allodynia, rats are placed in clear, plexiglass compartments with a wire mesh floor and allowed to habituate for a period of at least 15 minutes. After habituation, a series of von Frey monofilaments are presented to the plantar surface of the left (operated) foot of each rat. The series of von Frey monofilaments consists of six monofilaments of increasing diameter, with the smallest diameter fiber presented first. Five trials are conducted with each filament with each trial separated by approximately 2 minutes. Each presentation lasts for a period of 4-8 seconds or until a nociceptive withdrawal behavior is observed. Flinching, paw withdrawal or licking of the paw are considered nociceptive behavioral responses.

The invention is not to be limited in scope by the specific embodiments disclosed in the examples that are intended as illustrations of a few aspects of the invention and any embodiments that are functionally equivalent are within the scope of this invention. Indeed, various modifications of the invention in addition to those shown and described herein will become apparent to those skilled in the art and are intended to fall within the scope of the appended claims. A number of references have been cited, the entire disclosures of which are incorporated herein by reference for all purposes. 

What is claimed is:
 1. A compound of Formula (I):

or a pharmaceutically acceptable salt thereof wherein: Y₁ is O or S; Q is benzo; each R₂ is independently selected from: (a) -halo, —CN, —NO₂, —OT₃, —C(═O)T₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂OT₃, —S(═O)T₃, —S(═O)₂T₃, —O—S(═O)₂T₃, —S(═O)₂N(T₁)(T₂), —N(T₁)(T₂), —N(T₃)C(═O)T₃, —N(T₃)C(═O)N(T₁)(T₂), —N(T₃)S(═O)T₃, —N(T₃)S(═O)₂T₃, —N(T₃)C(═O)OT₃, and —N(T₃)S(═O)₂N(T_(i))(T₂); and (b) —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, —(C₆-C₁₄)bicycloalkyl, —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl, —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, -(5- or 6-membered)heterocyclyl, and -(7- to 10-membered)bicycloheterocyclyl, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₈ groups; and (c) -phenyl, -naphthalenyl, —(C₁₄)aryl, or -(5- or 6-membered)heteroaryl, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₇ groups; a is an integer selected from 0, 1, and 2; each R₃ is independently selected from: (a) -halo, —CN, —NO₂, —OT₃, —C(═O)T₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂OT₃, —S(═O)T₃, —S(═O)₂T₃, —O—S(═O)₂T₃, —S(═O)₂N(T₁)(T₂), —N(T₁)(T₂), —N(T₃)C(═O)T₃, —N(T₃)C(═O)N(T₁)(T₂), —N(T₃)S(═O)T₃, —N(T₃)S(═O)₂T₃, —N(T₃)C(═O)OT₃, and —N(T₃)S(═O)₂N(T₁)(T₂); and (b) —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, —(C₆-C₁₄)bicycloalkyl, —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl, —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, -(5- or 6-membered)heterocyclyl, and -(7- to 10-membered)bicycloheterocyclyl, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₈ groups; b is an integer selected from 0, 1, and 2; A and B are independently selected from: (a) —H, —CN, —C(═O)OT₃, and —C(═O)N(T₁)(T₂); and (b) —(C₃-C₁₂)cycloalkyl, —(C₃-C₁₂)cycloalkoxy, —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, and —(C₁-C₆)alkoxy, each of which is unsubstituted or substituted with 1 or 2 substituents independently selected from —OH, —S(═O)₂NH₂, —N(R₆)₂, ═NR₆, —C(═O)OT₃, —C(═O)N(R₆)₂, —N(R₆)C(═O)R₉, and -(5- or 6-membered)heterocyclyl, or 1, 2, or 3 independently selected -halo; or (c) A-B can together form a (C₂-C₆)bridge, which is unsubstituted or substituted with 1, 2, 3, 4, 5, 6, 7 or 8 substituents independently selected from —OH, —(C₁-C₄)alkyl, -halo, and —C(halo)₃, and which bridge optionally contains —HC═CH— or —O— within the (C₂-C₆)bridge; wherein the A-B bridge can be in the endo- or exo- configuration with respect to the 6-membered, nitrogen-containing ring that is fused to the Q group; or (d) A-B can together foil a —CH₂—N(R_(a))—CH₂— bridge, a

wherein the A-B bridge can be in the endo- or exo- configuration with respect to the 6-membered, nitrogen-containing ring that is fused to the Q group; R_(a) is —H, —(C₁-C₆)alkyl, —(C₃-C₇)cycloalkyl, —CH₂—C(═O)—R_(c), —(CH₂)—C(═O)—OR_(c), —(CH₂)—C(═O)—N(R_(c))₂, —(CH₂)₂—O—R_(c), —(CH₂)₂—S(═O)₂—N(R_(c))₂, R_(c), or —(CH₂)₂—N(R_(c))S(═O)₂—R_(c); R_(b) is selected from: (a) —H, —(C₁-C₆)alkyl, —(C₃-C₇)cycloalkyl, -(3- to 7-membered)heterocyclyl, —N(R_(c))₂, —N(R_(c))—(C₃-C₇)cycloalkyl, and —N(R_(c))-(3- to 7-membered)heterocyclyl; and (b) -phenyl, -naphthalenyl, and -(5- or 6-membered)heteroaryl, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₇ groups; and (c) —N(R_(c))-phenyl, —N(R_(c))-naphthalenyl, —N(R_(c))—(C₁₄)aryl, and —N(R_(c))-(5- to 10-membered)heteroaryl, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₇ groups; each R_(c) is independently —H or —(C₁-C₄)alkyl; Z is —[(C₁-C₁₀)alkyl optionally substituted by R₁₃]_(h)—, wherein h is 0 or 1; or —[(C₂-C₁₀)alkenyl optionally substituted by R₁₃]—; or —(C₁-C₁₀)alkyl-N(R₆)C(═Y)—, wherein Y is O or S; R₁ is selected from: (a) —H, -halo, —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂, —S(═O)NH₂, —S(═O)₂NH₂, —C(═O)OV₁, and —C(═O)CN; and (b) —(C₁-C₁₀)alkyl, —(C₂-C₁₀)alkenyl, —(C₂-C₁₀)alkynyl, —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy, —(C₃-C₁₄)cycloalkyl, —(C₆-C₁₄)bicycloalkyl, —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl, —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, and -(3- to 7-membered)heterocyclyl, each of which is unsubstituted or substituted with 1, 2, 3, or 4 independently selected R₈ groups; and (c)

 and (d) -phenyl, -naphthalenyl, —(C₁₄)aryl, and -(5- to 10-membered)heteroaryl, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₇ groups; or —Z—R₁ is 3,3-diphenylpropyl- optionally substituted at the 3 carbon of the propyl with —CN, —C(═O)N(R₆)₂, —C(═O)OV₁, or -tetrazolyl; or —Z—R₁ is —(C₁-C₄)alkyl substituted with tetrazolyl; each R₅ is independently —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), —CN, ═O, ═S, -halo, —N₃, —NO₂, —CH═N(R₉), —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)R₁₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)OR₉, —OC(═O)R₉, —OC(═O)OR₉, —S(═O)R₉, or —S(═O)₂R₉; each R₆ is independently —H, —(C₁-C₆)alkyl, or —(C₃-C₇)cycloalkyl, or two R₆ groups attached to the same nitrogen atom can together form a 5- to 8-membered ring, wherein the number of atoms in the ring includes the nitrogen atom, and in which one of the 5- to 8-membered ring carbon atoms is optionally replaced by O, S, or N(T₃); each R₇ is independently —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), —CN, -halo, —N₃, —NO₂, —CH═N(R₉), —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)R₁₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)N(T₁)(T₂), —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)N(T₁)(T₂), —C(═O)OR₉, —OC(═O)R₉, —OC(═O)N(T₁)(T₂), —OC(═O)OR₉, —S(═O)R₉, or —S(═O)₂R₉; each R₈ is independently —(C₁-C₄)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, -(5- or 6-membered)heteroaryl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —SR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), —CN, ═O, ═S, -halo, —N₃, —NO₂, —CH═N(R₉), —N(R₉)₂, —N(R₉)OH, —N(R₉)S(═O)R₁₂, —N(R₉)S(═O)₂R₁₂, —N(R₉)C(═O)R₁₂, —N(R₉)C(═O)N(T₁)(T₂), —N(R₉)C(═O)OR₁₂, —C(═O)R₉, —C(═O)N(T₁)(T₂), —C(═O)OR₉, —OC(═O)R₉, —OC(═O)N(T₁)(T₂), —OC(═O)OR₉, —S(═O)R₉, or —S(═O)₂R₉; each R₉ is independently —H, —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, —(C₃-C₈)cycloalkyl, —(C₅-C₈)cycloalkenyl, -phenyl, -benzyl, -(3- to 7-membered)heterocyclyl, —C(halo)₃, —CH(halo)₂, or —CH₂(halo); if h is 0, then R₁₁ can be —H, —CN, —C(═O)OR₉, or —C(═O)N(R₆)₂ or R₁₁ can be —(C₁-C₄)alkyl which is unsubstituted or substituted with —OH, —(C₁-C₄)alkoxy, —N(R₆)₂, —C(═O)OR₉, or —C(═O)N(R₆)₂; if h is 1, then R₁₁ can be —H, —CN, —OH, -halo, —C(═O)OR₉, or —C(═O)N(R₆)₂ or R₁₁ can be —(C₁-C₄)alkyl which is unsubstituted or substituted with —OH, —(C₁-C₄)alkoxy, —N(R₆)₂, —C(═O)OR₉, or —C(═O)N(R₆)₂; otherwise, wherein Z is —[(C₂-C₁₀)alkenyl optionally substituted by R₁₃]— or —(C₁-C₁₀)alkyl-N(R₆)C(═Y)—, then R₁₁ can be —H, —CN, —C(═O)OR₉, or —C(═O)N(R₆)₂ or R₁₁ can be —(C₁-C₄)alkyl which is unsubstituted or substituted with —OH, —(C₁-C₄)alkoxy, —N(R₆)₂, —C(═O)OR₉, or —C(═O)N(R₆)₂; each R₁₂ is independently —H or —(C₁-C₄)alkyl; R₁₃ is selected from: (a) -halo, —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂, —S(═O)NH₂, —S(═O)₂NH₂, —C(═O)OV₁, and —C(═O)CN; and (b) —(C₁-C₁₀)alkyl, —(C₂-C₁₀)alkenyl, —(C₂-C₁₀)alkynyl, —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy, —(C₅-C₁₀)cycloalkenyl, and -(3- to 7-membered)heterocyclyl, each of which is unsubstituted or substituted with 1, 2, 3, or 4 independently selected R₈ groups; and (c)

 and (d) -phenyl and -(5- to 10-membered)heteroaryl, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₇ groups; R₁₄ is —H, —CN, —OH, -halo, —C(═O)OR₉, or —C(═O)N(R₆)₂ or R₁₄ can be —(C₁-C₄)alkyl which is unsubstituted or substituted with —(C₁-C₄)alkoxy, —N(R₆)₂, —C(═O)OR₉, or —C(═O)N(R₆)₂; m is an integer selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11; n is an integer selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9; e and f are each an integer independently selected from 0, 1, 2, 3, 4, and 5 provided that 2≦(e+f)≦5; each p is an integer independently selected from 0, 1, 2, 3, and 4; each T₁ and T₂ is independently —H or —(C₁-C₁₀)alkyl which is unsubstituted or substituted with 1, 2, or 3 independently selected R₅ groups and, optionally, in which any —(C₁-C₁₀)alkyl carbon atom except the carbon atom bonded directly to the atom to which T₁ or T₂ is attached is independently replaced by 0, S, or N(R₆), or T₁ and T₂ can together form a 5- to 8-membered ring wherein the number of atoms in the ring includes the nitrogen atom to which T₁ and T₂ are bonded, said 5- to 8-membered ring is unsubstituted or substituted with 1, 2, or 3 independently selected R₅ groups and, optionally, any carbon atom in said 5- to 8-membered ring is independently replaced by O, S, or N(R₆); each T₃ is independently —H or —(C₁-C₁₀)alkyl which is unsubstituted or substituted with 1, 2, or 3 independently selected R₅ groups and, optionally, in which any —(C₁-C₁₀)alkyl carbon atom except the carbon atom bonded directly to the atom to which T₃ is attached is independently replaced by 0, S, or N(R₁₂); each V₁ is independently —H, —(C₁-C₆)alkyl, —(C₃-C₇)cycloalkyl, -phenyl, or benzyl; and each halo is independently —F, —Cl, —Br, or —I.
 2. The compound of claim 1 or a pharmaceutically acceptable salt thereof, wherein Y₁ is O.
 3. The compound of claim 2 or a pharmaceutically acceptable salt thereof, wherein R₁ is selected from: (a) -halo, —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂, —S(═O)NH₂, —S(═O)₂NH₂, —C(═O)OV₁, and —C(═O)CN; and (b) —(C₁-C₁₀)alkyl, —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy, —(C₃-C₁₄)cycloalkyl, —(C₆-C₁₄)bicycloalkyl, —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl, —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, and -(3- to 7-membered)heterocyclyl, each of which is unsubstituted or substituted with 1, 2, 3, or 4 independently selected R₈ groups; and (c)

 and (d) -phenyl, -naphthalenyl, —(C₁₄)aryl, and -(5- to 10-membered)heteroaryl, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₇ groups.
 4. The compound of claim 3 or a pharmaceutically acceptable salt thereof, wherein: a is 0; each R₃ is independently selected from: (a) -halo, —CN, —OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —S(═O)₂T₃, —N(T₁)(T₂), and —N(T₃)C(═O)T₃, and —N(T₃)C(═O)OT₃; and (b) —(C₁-C₆)alkyl, —(C₂-C₆)alkenyl, —(C₂-C₆)alkynyl, —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, and -(5- or 6-membered)heterocyclyl, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₈ groups; b is an integer selected from 1 and 2; A-B together form a (C₂-C₆)bridge, which is unsubstituted or substituted with 1, 2, 3, 4, 5, 6, 7 or 8 substituents independently selected from —OH, —(C₁-C₄)alkyl, -halo, and —C(halo)₃, and which bridge optionally contains —HC═CH— or —O— within the (C₂-C₆)bridge; wherein the A-B bridge can be in the endo- or exo-configuration with respect to the 6-membered, nitrogen-containing ring that is fused to the Q group; Z is —[(C₁-C₁₀)alkyl optionally substituted by R₁₃]_(h)—, wherein h is 0 or 1; R₁ is selected from: (a) —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂, —S(═O)NH₂, —S(═O)₂NH₂, —C(═O)OV₁, and —C(═O)CN; and (b) —(C₁-C₁₀)alkyl, —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy, —(C₃-C₁₄)cycloalkyl, —(C₆-C₁₄)bicycloalkyl, —(C₈-C₂₀)tricycloalkyl, —(C₅-C₁₀)cycloalkenyl, —(C₇-C₁₄)bicycloalkenyl, —(C₈-C₂₀)tricycloalkenyl, and -(3- to 7-membered)heterocyclyl, each of which is unsubstituted or substituted with 1, 2, 3, or 4 independently selected R₈ groups; and (c)

 and (d) -phenyl and -(5- to 10-membered)heteroaryl, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₇ groups; R₁₃ is selected from: (a) -halo, —CN, —OH, —CH₂OH, —CH₂CH₂OH, —NO₂, —N(R₆)₂, —S(═O)NH₂, —S(═O)₂NH₂, —C(═O)OV₁, and —C(═O)CN; and (b) —(C₁-C₁₀)alkyl, —O(C₁-C₆)alkyl, —(C₃-C₇)cycloalkoxy, and -(3- to 7-membered)heterocyclyl, each of which is unsubstituted or substituted with 1, 2, 3, or 4 independently selected R₈ groups; and (c)

 and (d) -phenyl and -(5- to 10-membered)heteroaryl, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₇ groups.
 5. The compound of claim 4 or a pharmaceutically acceptable salt thereof, wherein each R₃ is independently selected from: (a) -halo, -OT₃, —C(═O)OT₃, —C(═O)N(T₁)(T₂), —N(T₁)(T₂), —N(T₃)C(═O)T₃, and —N(T₃)C(═O)OT₃; and (b) —(C₁-C₆)alkyl, —(C₁-C₆)alkoxy, —(C₃-C₇)cycloalkyl, and -(5- or 6-membered)heterocyclyl, each of which is unsubstituted or substituted with 1, 2, or 3 independently selected R₈ groups.
 6. The compound of claim 4 or a pharmaceutically acceptable salt thereof, wherein each R₃ is independently selected from: (a) —C(═O)OT₃ wherein the T₃ of said —C(═O)OT₃ is —H or —(C₁-C₄)alkyl; and (b) —(C₁-C₃)alkyl, each of which is unsubstituted or substituted with 1 or 2 independently selected R₈ groups; and (c) —N(T₁)(T₂), wherein T₁ is hydrogen and T, is hydrogen or —(C₁-C₁₀)alkyl which alkyl is unsubstituted or substituted with 1 or 2 independently selected R₅ groups.
 7. The compound of claim 4 or a pharmaceutically acceptable salt thereof, wherein each R₃ is independently selected from: (a) —C(═O)OT₃ wherein the T₃ of said —C(═O)OT₃ is —H or —(C₁-C₄)alkyl; and (b) —(C₁-C₃)alkyl, each of which is unsubstituted or substituted with 1 or 2 independently selected R₈ groups; and (c) —N(T₁)(T₂), wherein T₁ is hydrogen and T₂ is hydrogen or —(C₁-C₁₀)alkyl which alkyl is unsubstituted or substituted with 1 or 2 independently selected R₅ groups; and (d) —OT₃, wherein T₃ is —H or —(C₁-C₄)alkyl; and (e) —N(T₃)C(═O)T₃, wherein T₃ is —H or —(C₁-C₄)alkyl.
 8. The compound of claim 7 or a pharmaceutically acceptable salt thereof, wherein h is
 1. 9. The compound of claim 8 or a pharmaceutically acceptable salt thereof, wherein —Z—R₁ is:

wherein each R_(z) is independently —H, —CH₃, or —CH₂CH₃.
 10. The compound of claim 7 or a pharmaceutically acceptable salt thereof, wherein h is
 0. 11. The compound of claim 10 or a pharmaceutically acceptable salt thereof, wherein A and B together form a bridge such that the bridged-piperidine is:

wherein each R_(d) is independently —H, —(C₁-C₄)alkyl, -halo, or —C(halo)₃.
 12. The compound of claim 10 or a pharmaceutically acceptable salt thereof, wherein A and B together form a bridge such that the bridged-piperidine is:


13. The compound of claim 12 or a pharmaceutically acceptable salt thereof, wherein: (a) R₁ is —(C₃-C₁₄)cycloalkyl, —(C₃-C₁₄)cycloalkenyl, —(C₆-C₁₄)bicycloalkyl, —(C₇-C₁₄)bicycloalkenyl, or —(C₈-C₂₀)tricycloalkyl, each of which is unsubstituted or substituted with 1, 2, 3, or 4 independently selected R₈ groups; and (b) each R₈ is independently —(C₁-C₄)alkyl, —(C₁-C₆)alkyl-C(═O)OR₉, —N(R₉)(C₁-C₆)alkyl-C(═O)OR₉, —OR₉, —C(halo)₃, —CH(halo)₂, —CH₂(halo), -halo, —N(R₉)₂, —C(═O)N(T₁)(T₂), or —C(═O)OR₉.
 14. The compound of claim 10 or a pharmaceutically acceptable salt thereof, wherein A and B together form a bridge such that the bridged-piperidine is:


15. The compound of claim 14 or a pharmaceutically acceptable salt thereof, wherein the A-B bridge of the bridged-piperidine is in the endo- configuration with respect to the 6-membered, nitrogen-containing ring that is fused to the Q group.
 16. The compound of claim 15 or a pharmaceutically acceptable salt thereof, wherein —Z—R₁ is:

wherein each R_(z) is independently —H, —CH₃, or —CH₂CH₃.
 17. The compound of claim 15 or a pharmaceutically acceptable salt thereof, wherein —Z—R₁ is:


18. The compound of claim 15 or a pharmaceutically acceptable salt thereof, wherein —Z—R₁ is:

wherein R_(z) is —H, —CH₃, or —CH₂CH₃.
 19. A composition comprising an effective amount of the compound or a pharmaceutically acceptable salt of the compound of claim 1 and a pharmaceutically acceptable carrier or excipient.
 20. A method for modulating opioid receptor like-1 receptor function in a cell, comprising contacting a cell capable of expressing the opioid receptor like-1 receptor with an effective amount of the compound of claim 1 or a pharmaceutically acceptable salt thereof.
 21. The method of claim 20, wherein the compound or the pharmaceutically acceptable salt of the compound acts as an agonist at the opioid receptor like-1 receptor.
 22. The method of claim 20, wherein the compound or the pharmaceutically acceptable salt of the compound acts as a partial agonist at the opioid receptor like-1 receptor.
 23. The method of claim 20, wherein the compound or the pharmaceutically acceptable salt of the compound acts as an antagonist at the opioid receptor like-1 receptor.
 24. A method for modulating opioid receptor like-1 receptor function in a cell, comprising contacting a cell capable of expressing the opioid receptor like-1 receptor with an effective amount of the composition of claim
 19. 25. The method of claim 24, wherein the composition acts as an agonist at the opioid receptor like-1 receptor.
 26. The method of claim 24, wherein the composition acts as a partial agonist at the opioid receptor like-1 receptor.
 27. The method of claim 24, wherein the composition acts as an antagonist at the opioid receptor like-1 receptor.
 28. A compound which is:

wherein M₁ is:

 and M₂ is:

or a pharmaceutically acceptable salt thereof.
 29. The compound of claim 28, wherein the compound is:

wherein M₁ is:

 and M₂ is:

or a pharmaceutically acceptable salt thereof.
 30. A compound which is:

or a pharmaceutically acceptable salt thereof.
 31. The compound of claim 30, which is:

or a pharmaceutically acceptable salt thereof.
 32. The compound of claim 31, which is: 